She is not sure whether she cut her hair properly in order to exit from ihraam for Hajj. What should she do?
Question

                I am an elderly woman, and last year I performed the obligatory Hajj, praise be to Allaah. After doing tawaaf al-ifaadah, I asked one of the sisters to cut my hair for me so that I could exit ihraam, but after we came back to our own country, I began to doubt whether this lady had cut my hair in the required manner or not. I am asking you for advice so that I can put my mind at rest as to whether my Hajj is valid.
Praise be to Allah.
    The scholars have stated that if a person does an act of 
    worship and finishes it, then is uncertain as to whether he has completed it 
    or not, and this doubt does not reach the level of certainty, then no 
    attention should be paid to it and the act of worship is valid and complete, 
    in sha Allaah. 

    This applies especially in the case of one who experiences a 
    lot of doubts concerning acts of worship. It is not permissible for such a 
    person to pay attention to his doubts, for they are tricks of the shaytaan. 

    Ibn Qudaamah said in al-Mughni (3/187): 
If a person has doubts 
    about his tahaarah (purity) whilst he is doing tawaaf, that tawaaf is not 
    valid, because he had doubts about a condition of worship before he had 
    finished it. The same applies if he has doubts about his tahaarah whilst 
    praying. 

    But if the doubts come after he has finished the act of 
    worship, then he does not have to do anything, because a doubt about an act 
    of worship after it has been completed does not have any effect on it. End 
    quote. 

    Al-Zarkashi said in al-Manthoor fi’l-Qawaa’id al-Fiqhiyyah 
    (2/257): 
Imam al-Shaafa’i 
    differentiated between doubts during an action and doubts after an action. 
    In the second case he did not say that it must be repeated, because that 
    would cause hardship. If a worshipper were required to remember what he had 
    done in prayer, that would be too difficult for him and no one would be able 
    to do that, so there is some leniency in the matter. End quote. 

    The Standing Committee was asked the following question:  

    Should any attention be paid to doubts about the number of 
    rak’ahs, or the number of circuits of tawaaf or saa’i, after the action has 
    been completed? Is that also the case with regard to wudoo’ or not? i.e., 
    should no attention be paid to doubts that come after the act of worship has 
    been completed? 

    They replied: 

    No attention should be paid to doubts that come after 
    completing tawaaf, saa’i and prayer, because it seems that the act of 
    worship is sound. End quote. 

    Fataawa al-Lajnah al-Daa’imah, 
    7/143 

    Shaykh Ibn ‘Uthaymeen was asked about a person who 
    experienced a great deal of doubt concerning his prayer: what is your 
    advice? 

    He replied: 

    No attention should be paid to many doubts, because that will 
    lead to waswaas (whispers from the shaytaan). The shaytaan will not stop at 
    raising doubts concerning that, rather he will make him doubt other things, 
    until he even makes him have doubts concerning Tawheed and the attributes of 
    Allaah, may He be exalted, or he may make him wonder whether his wife is 
    divorced from him or is still his wife. This poses a threat to a man’s 
    sanity and his religious commitment. 

    Hence the scholars said that no attention should be paid to 
    doubts in three cases: 

    1 – When it is simply imagination with no basis in reality. 
    This should be ignored completely and no attention paid to it at all.

    2 – When there are many doubts and a person has doubts every 
    time he does wudoo’, or every time he prays, or every time he does 
    something. This should also be ignored completely and no attention paid to 
    it at all. 

    3 – If the doubt comes after completing an act of worship. No 
    attention should be paid to it so long as one is not certain of the matter. 
For example: if a person 
    is uncertain, after saying the salaam at the end of the prayer, whether he 
    prayed three or four rak’ahs of a four-rak'ah prayer, he should not pay any 
    attention to this doubt because he has completed the prayer. But if he is 
    certain that he did not pray more than three rak’ahs, he should do the 
    fourth rak’ah if he has just recently completed the prayer, then do the 
    prostration of forgetfulness after saying the tasleem. If some time has 
    passed, then he should do the whole prayer over again. End quote.   

    Majmoo’ Fataawa Ibn ‘Uthaymeen, 14/ 
    question no. 746 
And Allaah knows 
    best.