Is wudu' obligatory for tawaf?

Question:
A woman performed the tawaf of 'Umrah, and during her second lap she remembered that she had not performed wudu'. She asked a man, and he told her to complete it and that there was no harm. It is known that she is pregnant and finds it difficult to leave the tawaf to perform wudu'. What is the ruling on her 'Umrah? Does she have to repeat the tawaf?

Answer:
She has to repeat the tawaf, the sa'y, and the shortening of the hair, because she has not completed her 'Umrah yet. The tawaf she performed without wudu' is invalid. This is because one of the conditions for the validity of tawaf is purity from hadath and purity from najasah, just like in prayer. So she must go back and perform the 'Umrah: tawaf, sa'y, and shortening of the hair, and she should hasten to do so. If she says she is pregnant and in a wheelchair, she can be carried in a wheelchair and the tawaf and sa'y can be performed for her in a wheelchair. Yes.