How can a woman shorten her hair in ‘umrah if it is layered?
Question

                What is the ruling on a woman who did ‘umrah and cut a fingertip’s length from her hair, but she did not take from all of her hair because her hair is layered, and she could not take from all parts of it because that is too difficult? Does she have to do anything? Please note that she was unaware of this matter, that it is obligatory to take something from all parts of the hair.
Praise be to Allah.
    What is required is to cut the hair following Hajj or ‘Umrah, 
    taking from all parts of the head. For more information please see the 
    answer to question no. 110804 

    If it is not possible to take from all parts of the hair, 
    because the hair is layered, then the woman should gather her hair and cut 
    something from the ends. 

    Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) was 
    asked: Some women have layered hair, as they call it, and it is not like 
    braids from which the length of a fingertip may be cut. How can they cut 
    from all over the head? 

    He replied: It should be cut from each layer. 

    Then I asked him: But it is not possible to tell the layers 
    apart. 

    He said: In that case it is sufficient to take from the 
    ends. 

    End quote from Thamaraat at-Tadween.