This was immigration fraud before Trump and it isn't likely to improve after Trump.
She can get deported whether or not she makes an application.
Don't know, this isn't the HOW DO I BREAK THE LAW AND GET AWAY WITH IT FORUM.
Evidence that the marriage (divorce or otherwise) was not bona fide, but rather an attempt to commit immigration fraud can certainly lead to recovation of residence status (even before the conditional green card expires, but it certaily will be looked at then).
There's no magic time limit that makes immigration fraud legitimate.

