A Christian woman is asking a Muslim woman for help in raising a Muslim girl
Question

                I'm in a little strange situation now and cannot say no to the person who is asking me for help. I'm a university student in the U.S. and meet this African American women who is a Christian, began talking to me and I felt the need to talk to her since she was going through a lot of issues and things that bothered her. I tried not getting to close to her, but she was unavoidable and I felt the need to be nice so I don't make it seem that Muslims are mean, etc. 

Her husband's family she says are Muslims, I suppose they are, and did not judge. Her husband has two+ women who he has a relation with.One of the ladies he has a relation with has a 9 year old daughter.

This 9 year old child has attempted suicide and is really depressed and cares nothing about life. 

The African American lady that I met at school told me she has taken it upon herself to try and care for this 9 year old daughter even though she is not her child. She wants to know the Islamic ruling on how to care for this child so that she doesn't lose her parents' faith.

I'm not sure how to go about this situation, especially since the women is of a different faith than the 9 year old child.

If you understood my situation well, can you provide me with advice on how to help the women help the child. The mother of this child seems to only tell her this and that is wrong in Islam and don't do it. How is the best way to convince this child of the reality of life, etc. The child doesn't have a close relationship with the parents and most likely is in a bad school setting, with bad friends, etc. I myself do not know the whole situation of the child but will know soon through the African American lady who asked for my help.
Praise be to Allah.
    If this woman is the mother of that girl it is not 
    permissible for her – according to sharee‘ah – to have custody of her Muslim 
    daughter, because a kaafir cannot be entrusted with raising a Muslim child 
    in Islam; rather he will cause the child to follow his own religion. We have 
    discussed this previously in the answer to question no.
    21516. So how about if she is 
    not even her daughter? 

    It is shameful – let alone sinful – for a Muslim man to leave 
    his children without any care and not bring them up in Islam, and to not 
    care about anything except marriage without being prepared to take 
    responsibility for its consequences. Fathers and mothers who neglect their 
    children so that they end up becoming corrupt or apostatise from their 
    religion are partners in this serious crime that affects their children, 
    because they are the reason why it happens. Hence it is very important that 
    you play a role through the local Islamic centre or some righteous people in 
    the area, who could try to contact the father of that girl and inform him of 
    his responsibilities towards his daughter, and advise him to take 
    responsibility with his wife, and point out the dangers of neglecting this 
    little girl. 

    We appreciate the questioner’s keenness to do good and help 
    people, and her concern about this Muslim girl’s situation. It is clear that 
    she is as upset as we are to see that the one who is taking charge of 
    raising this Muslim girl is a Christian woman, who it is expected will turn 
    her away from her natural state and true religion and cause her to become a 
    Christian or to end up without any religion. Hence we advise the sister who 
    asked this question to pay a great deal of attention to two important 
    matters: 

    (i)After thanking this woman for 
    coming to her and asking about the best way to raise a Muslim girl, she 
    should try to get her to hand over custody of this Muslim girl to a Muslim 
    family or an Islamic centre. Even better than that would be to look for 
    Muslim relatives of this girl who are trustworthy in terms of their attitude 
    and religious commitment, who could look after her and gave her a home. You 
    have to be gentle and polite in doing this

    (ii)If this woman does not agree to 
    give up looking after this child, then we advise you to stay in close 
    contact with her, to offer advice, care and education, so that this woman 
    will not be the sole person concerned with this girl’s upbringing lest she 
    teaches her that which could lead to the corruption of her religious 
    commitment or behaviour. For example, this woman could make arrangements for 
    the girl to attend an Islamic school or spend time with a religiously 
    committed family or with a woman who has good knowledge of Islam and works 
    in da‘wah. If none of that is possible, then you should keep in touch with 
    this girl so that you can communicate with her, so that she can remain in 
    touch with her religion, her nature will not be spoiled and she will not 
    apostatise from her religion. And seek reward for all of that with Allah, 
    may He be exalted, and be patient in doing so, until Allah guides her 
    parents – or one of them – to take her back and raise her in the true 
    religion or the girl can go to a Muslim who can raise her such as a woman or 
    an institution or a righteous person among her relatives.

    Perhaps your being close to that woman will be a cause of her 
    becoming Muslim, then she would be a suitable and trustworthy guardian to 
    take care of that girl. 

    This is what we think you should do, and we encourage you to 
    do it. We ask Allah to guide you and help you to do that which pleases Him. 

    See also “How to raise a child” in the answer to question no.
    10016 

    And Allah knows best.