Mexico generally isn't considered to be dangerous in the legal/immigration sense - had she escaped from Haiti, for example, she would like have a much better chance at staying for that reason. If she truly left a harmful environment, it doesn't make sense that she didn't do something back then. See where I'm coming from?
The attorney is correct in saying that there's no guarantee. I will say that the odds are not in her favor at the moment - there is a strong chance she'll be leaving, and then she'll need to apply for a hardship waiver.
read more here
Please keep contacting attorneys. And be prepared - this could end up very, very costly.

