This is how it works (the much simplified version)
1. She's overstayed her visa
2. There are only one or two ways she can do this and adjust her status - marriage is one (I'm assuming that's what's happening, yes?)
3. Even if she's currently a permanent resident (which, by your words, she is not) her visa can be revoked at ANY TIME once USCIS gets wind of things...you DO intend to tell USCIS the truth, I take it?
4. If she is convicted, game over. She will be placed in removal proceedings.
5. Even if she is not convicted, the charges alone may place her residency in jeopardy. Again, you don't intend to lie, right?
Do you realize that both of you will have to be interviewed at some point by USCIS? And you'll be asked certain questions? And by that point they'll have both of your criminal records?
