Is it obligatory for a woman to leave the house in which two of her children died, after she saw in a dream that her remaining in it would lead to the death of the rest of her children?

If the reality is as mentioned, then the woman has a choice: if she wishes, she can reside in this house, and if she wishes, she can move out of it, due to the Prophet's (peace be upon him) saying: "Ill omens are in three: in the house, the woman, and the horse."