She tried to work out where tawaaf ended, but she is not sure precisely where the Black Stone is, and she is asking whether her tawaaf was valid
Question

                I visited Makkah in Ramadan and I have some questions that have been on my mind concerning the validity of my ‘umrah, and I hope that you can answer me as quickly as possible, may Allah reward you with good. Please publish my question on your website so that others may benefit.

~1~

The line was removed, hence for this reason and because of the severe crowding, we were unable to figure out exactly where the Black Stone is. Hence I did tawaaf and so on to the best of my ability. Is this action valid?

~2~

My mahram cut my hair after I had performed ‘umrah, but he did not do ‘umrah himself. Is that acceptable?
Praise be to Allah.
    
    Whoever circumambulates the Ka‘bah seven times, from the Black Stone to the 
    Black Stone, his tawaaf is valid, but if he fell short of that, even by one 
    footstep, then his tawaaf is not valid. 

    
    An-Nawawi (may Allah have mercy on him) said: If any of the seven circuits 
    remains incomplete, then his tawaaf is not valid, regardless of whether what 
    was omitted was small or great, and whether he is now in Makkah or in his 
    homeland, but he is not obliged to offer a compensatory sacrifice. This is 
    our view and it is the view of the majority of scholars.

    
    End quote from Sharh al-Muhadhdhab (8/29) 

    
    Al-Hajjaawi said in az-Zaad: Whoever omits anything of tawaaf, it is 
    not valid. 

    
    Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said:

    
    “Anything” includes even if he omitted one step or one handspan of tawaaf; 
    in that case it is not valid.

    
    End quote from ash-Sharh al-Mumti‘ (7/249) 

    
    Secondly: 

    
    In order for tawaaf to be valid, it is not essential that the individual 
    stand on the line, whether at the beginning or end of tawaaf. Rather if he 
    comes in line with the Black Stone, then goes around seven times from the 
    Black Stone to the Black Stone, then his tawaaf is valid. 

    
    Al-Hajjaawi said in Zaad al-Mustaqni‘: Then he should come in line 
    with the Black Stone with all of his body. 

    
    Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: I have my 
    reservations about the idea of coming in line with it with all of the body, 
    because it seems that what the Sahaabah (may Allah be pleased with them) did 
    is that when they came in line with it, that was either with the entire body 
    or with the right side of the body or the left side, and the matter is not 
    so strict. But according to the fuqaha’ this is essential. But then there is 
    a problem: how is one to do that precisely? According to the author, the 
    entire body must come in line with the Black Stone. However the correct view 
    is that that is not obligatory and that if he comes in line with it, even if 
    that is only with part of his body, then that is sufficient. This was the 
    view of Shaykh al-Islam, and there is no need to come in line with it with 
    all of the body, although if that is possible then it is undoubtedly 
    preferable.

    
    End quote from ash-Sharh al-Mumti‘. 

    
    Based on that, if the matter is as you describe, that you tried hard to 
    figure out where the Black Stone is, and you did the best you could, then it 
    does not appear to be the case that you have to do anything further, so long 
    as you completed seven circuits from the Black Stone to the Black Stone, 
    even if it so happened that you made a slight error at the beginning or end 
    of one of these circuits, so long as you started tawaaf and ended it in line 
    with the Black Stone, to the best of your knowledge. 

    
    Thirdly: 

    
    With regard to your saying that your mahram cut your hair, there is nothing 
    wrong with that. What is required is cutting the hair after finishing tawaaf 
    and sa‘i. Whoever did that, it is a valid, whether he was in ihram for Hajj 
    or ‘Umrah or not, if he was one of your mahrams. 

    
    Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: If a woman cuts 
    her hair herself, or a man shaves his head himself, or someone who is in 
    ihram shaves it, or someone who is not in ihram shaves it, all of that is 
    acceptable.

    
    End quote from Majmoo‘ al-Fataawa (22/483). 

    
    And Allah knows best.