M.M.
Something doesn't sound right. If they went through a divorce in the states, then she can't be illegal - she would have been deported then. If she married an American, then she is no longer illegal. I think more clarification is needed.
I don't think you know or have ALL of the information. She had to have supplied a SS# in order to get the divorce. Again, something is not right, plus she is playing the system. Sorry, I don't have much sympathy.