Well, that was my 2 cents and guess you didn't like the idea. She can try for being your dependent , but since she has violated her visa status, chances of being that approved is very unlikely. No pun intended but giving birth to a US citizen won't help either. She might be able to stay here but if she leaves USA she won't ever be able to come back.  The kid has to be 18 before they can file for citizenship based on the fact that she is their immediate relative .