quick questions rufus, are you a USC?
If you are, have you been in contact with a few lawyers and asked what they think her chances would be to be granted a waiver from facing the ban in Mexico? considering that she has a USC child that is dependent on her, the age when she entered the country, the length of time she has lived in the country, and assuming you are a USC, a spouse that can petition her, the chances might not be too bad, but, ask several lawyers, and definitely, don't jump at the first one that says he can do it, ask lots of questions, research thoroughly, cross reference with other trustworthy and very good lawyers, to say this would be easy would be a pretty significant understatement, but it could be a potential option.