She entered ihraam for ‘umrah but was afraid of the locusts in the haram so she did not complete it
Question

                I intended to start Umrah and I went to Mecca to start performing it. The locusts were many there and I was too scared of them so I could not continue the Umrah and I just started crying. Some friends said to me that I have to sacrifice an animal and that I committed a sin especially that I did not say: “if I was trapped by a reason then my place is where I am stuck at” what shall I do?.
Praise be to Allah.The one who enters ihraam 
    for ‘umrah is obliged to complete it, because Allaah says (interpretation of 
    the meaning): 
“And perform properly 
    (i.e. all the ceremonies according to the ways of Prophet Muhammad
    صلى الله عليه وسلم), the Hajj and ‘Umrah 
    (i.e. the pilgrimage to Makkah) for Allaah. But if you are prevented (from 
    completing them), sacrifice a Hady (animal, i.e. a sheep, a cow, or a camel) 
    such as you can afford”
[al-Baqarah 2:196].
Being prevented from 
    completing ‘umrah refers to an obvious obstacle, such as an enemy or 
    sickness. What you have mentioned is not an impediment to completing 
    ‘umrah. 
Based on this, what you 
    must do is go back and complete your ‘umrah. So do tawaaf and saa’i, then 
    cut your hair. Then you will have exited ihraam for ‘umrah. 
Right now you are still in 
    ihraam, and you have to avoid the things that are forbidden in ihraam, such 
    as wearing perfume, cutting your hair and nails, wearing gloves and niqaab, 
    being involved in a marriage contract, or having intercourse or doing any of 
    the things that lead to it. 
If you have done any of 
    these things out of ignorance or by mistake, you do not have to do 
    anything. 
See the answer to question 
    no. 36522 and
    49026. 
When you go back to Makkah, 
    you do not have to enter ihraam from the meeqaat because you are still in 
    ihraam since you first entered ihraam; rather you should go and do tawaaf 
    straightaway. 
Shaykh Ibn ‘Uthaymeen (may 
    Allaah have mercy on him) was asked about a woman who entered ihraam then 
    she cancelled her ‘umrah and did another ‘umrah a few days later. Is what 
    she did correct? What is the ruling on the things she did that were 
    forbidden in ihraam? 
He replied: This action is 
    not correct because when a person starts to do Hajj or ‘umrah, it is haraam 
    for him to cancel it except for a valid shar’i reason. Allaah says 
    (interpretation of the meaning): 
“And perform properly 
    (i.e. all the ceremonies according to the ways of Prophet Muhammad
    صلى الله عليه وسلم), the Hajj and ‘Umrah 
    (i.e. the pilgrimage to Makkah) for Allaah. But if you are prevented (from 
    completing them), sacrifice a Hady (animal, i.e. a sheep, a cow, or a camel) 
    such as you can afford”
[al-Baqarah 2:196].
So this woman has to repent 
    to Allaah and from what she has done. But her ‘umrah is valid, because even 
    though she cancelled her ‘umrah, it cannot be cancelled.  This is something 
    that applies only to Hajj and ‘umrah. If the person who is doing ‘umrah 
    decides during his ‘umrah to cancel his ‘umrah, it is not cancelled, and if 
    he decided to cancel his Hajj during his Hajj, it is not cancelled. Hence 
    the scholars said: The pilgrimage cannot be cancelled by intending to cancel 
    it.  
Based on that, we say: This 
    woman is still in a state of ihraam, from the time when she formed the 
    intention, until she completes ‘umrah. Her intention to cancel it does not 
    have any effect, rather it is still required of her. 
To sum up: with regard to 
    this woman we say: her ‘umrah is valid, but she should not try to cancel 
    ihraam again, because if she tries to cancel ihraam she will not free 
    herself from it. As for what she has done of things that are forbidden when 
    in ihraam, let us assume that her husband has had intercourse with her, and 
    intercourse during Hajj or ‘umrah is one of the gravest of these forbidden 
    things. But she does not have to do anything, because she was unaware, and 
    anyone who does one of the things that are forbidden in ihraam out or 
    ignorance or by mistake or under compulsion does not have to do anything. 
    End quote from Majmoo’ Fataawa Ibn ‘Uthaymeen (21/351). 
And Allaah knows best.