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Are you saying your son is sponsoring her for PR status?
If she wants to stop sponsoring her he can. It is his right.But if she wants to say she can apply under Humanitarian and Compassionate grounds based on her situation and the birth of the baby.
And you should speak to him because if he wants to remain in the baby's life he should want her to get her PR status.
I suggest that she consult with an immigration lawyer as soon as possible if he is really going to stop the sponsorship as she will need legal assistance quickly and before she gets a removal notice.