She works in a residence for foreign female students
Question

                My sister works in a female students’ residence, and she stays overnight outside the home twice a week. The students who live in this residence are all foreigners. Some of them have brothers who are studying in the same university but they live in another residence, but many of them do not have any brothers or mahrams here, or some of them may have relatives but they are living far away from them. I know that it is not permissible for a girl to travel or go abroad in order to learn that which she could learn in her own country. Unfortunately the conduct of most of these girls is not good. What is the ruling on my sister’s working in this place – is it halaal or haraam? And what is the ruling on her staying overnight outside our house, especially since I know the hadeeth which says “May Allaah curse the woman who takes off her clothes anywhere other than in her husband’s house”?.
Praise be to Allah.
    Firstly: 

    There is nothing wrong with your sister working in the 
    students’ residence, especially if it is in your city, but if it is in 
    another city then it is not permissible for her to travel there and back 
    except with a mahram, but it is permissible for her to stay in that 
    residence without a mahram, because what is required is only that she be 
    accompanied by the mahram on the road. The same also applies to the female 
    students who live there. Your sister is not expected to examine each student 
    to find out whether she came with her mahram or travelled without him, 
    rather it is sufficient that her work in the residence does not involve 
    anything haraam. Administration, guard duties, cleaning and so on are all 
    permissible and there is nothing wrong with that, in sha Allaah. 

    Shaykh Ibn Baaz (may Allaah have mercy on him) said in 
    Fataawa Noor ‘ala al-Darb (tape no. 288): 

    There is nothing wrong with what you have done. There is no 
    harm in a woman staying or living in a city without a mahram and there is no 
    sin in it, especially if there is no danger involved in that, if she is 
    among other women or in a workplace that is separate from men doing work 
    that Allaah has permitted, or in a department that is women-only. There is 
    nothing wrong with any of that. What is forbidden is travelling; you should 
    not travel except with a mahram, and you should not come without a mahram. 
    As for staying among women doing permissible work, there is nothing wrong 
    with that, praise be to Allaah. End quote. 

    See also the answer to question no. 
    45917. 

    Secondly: 

    With regard to the hadeeth mentioned at the end of the 
    question, it is the hadeeth of ‘Aa’ishah according to which the Prophet  
    (peace and blessings of Allaah be upon him) said: “There is no woman who 
    takes off her clothes anywhere but in her own house, but she has torn (the 
    veil) which exists between her and Allaah.” Narrated by Abu Dawood (4010) 
    and classed as saheeh by al-Albaani. 

    Al-Manaawi said in Fayd al-Qadeer (3/163), commenting 
    on this hadeeth: 

    It is a metaphor for her uncovering herself before 
    non-mahrams and not covering herself in front of them. End quote. 

    What is meant in this hadeeth is a woman who takes off her 
    clothes in the presence of non-mahram men, or in a place where non-mahram 
    man can see her, such as public places or places frequented by evil-doers 
    and the like. But if she is in a safe place, such as if she is in the house 
    of her mahrams or parents, or in a place where she and her husband have made 
    a stop during a journey, or she needs medical treatment or she needs to do 
    ghusl for some shar’i reason and so on, then there is no sin on her, and the 
    hadeeth does not forbid such cases. 

    This has also been explained in the answer to question no. 
    34750. 

    Thirdly: 

    The sincere Muslim carries his da’wah with him wherever he 
    goes. If the situation in the students’ residence is as you describe, and 
    there is little righteousness, then your sister should strive to spread 
    goodness there and enjoin what is good and forbid what is evil, and strive 
    to change things for the better as much as she can. Thus she will fulfil her 
    duty before Allaah. 

    Shaykh Ibn Baaz (may Allaah have mercy on him) was asked the 
    following question in Majmoo’ al-Fataawa (7/274): 

    I am a girl who lives in the students’ residence. Allaah has 
    guided me to the truth, and I have begun to adhere to it, praise be to 
    Allaah. But I am very upset because of what I see around me of some sins and 
    evil deeds, especially among some of my fellow-students, such as listening 
    to music and malicious gossip. I advised them often but some of them make 
    fun of me and mock me, and say that I am being extreme. What should I do, 
    may Allaah reward you with good? 

    He (may Allaah have mercy on him) replied: 

    What you have to do is denounce the evil as much as you can, 
    by kind words and good manners, quoting verses and ahaadeeth which speak of 
    that, according to your level of knowledge. Do not take part in listening to 
    music or gossiping or other haraam words and deeds, and withdraw as much as 
    you can until they start to speak about something else, because Allaah says 
    (interpretation of the meaning): 

    “And when you (Muhammad) see those who engage in a false 
    conversation about Our Verses (of the Qur’aan) by mocking at them, stay away 
    from them till they turn to another topic”

    [al-An’aam 6:68]

    If you denounce them as much as you can and withdraw from 
    what they are doing, then their deeds or criticism of you will not affect 
    you, as Allaah says (interpretation of the meaning): 

    “O you who believe! Take care of your ownselves. If you 
    follow the (right) guidance [and enjoin what is right (Islamic Monotheism 
    and all that Islam orders one to do) and forbid what is wrong (polytheism, 
    disbelief and all that Islam has forbidden)] no hurt can come to you from 
    those who are in error. The return of you all is to Allaah, then He will 
    inform you about (all) that which you used to do”

    [al-Maa'idah 5:105]

    Allaah explains that the believer will not be harmed by those 
    who go astray if he adheres to the truth and follows true guidance, by 
    denouncing evil and adhering steadfastly to the truth and calling others to 
    it. Allaah will grant you a way out, and Allaah will benefit them by means 
    of your guidance if you are patient and seek reward, in sha Allaah. Receive 
    the glad tidings of great goodness and good consequences so long as you 
    remain steadfast in adhering to the truth and denouncing that which goes 
    against it, as Allaah says (interpretation of the meaning): 

    “and the (blessed) end is for the Muttaqoon (the pious)”

    [al-A’raaf 7:128] 

    “So be patient. Surely, the (good) end is for the 
    Muttaqoon (the pious)”

    [Hood 11:49] 

    “As for those who strive hard in Us (Our Cause), We will 
    surely guide them to Our paths (i.e. Allaah’s religion — Islamic 
    Monotheism). And verily, Allaah is with the Muhsinoon (good-doers)”

    [al-‘Ankaboot 29:69]

    May Allaah help you to do that which pleases Him and bless 
    you with patience and steadfastness, and may He help your sisters and family 
    and colleagues to do that which He loves and which pleases Him, for He is 
    All-Hearing, Ever-Near, and He is the Guide to the straight path. End 
    quote. 

    And Allaah knows best.