There is. It works something like this: You apply for a waiver of the 10 year ban imposed on you for illegal presence in the U.S. before leaving and get a decision before departing. That decision is based on the same factors described above- compelling circumstances for a USC/LPR relative. Then you get to your original country and apply for a green card, and waive the bar.

Trouble for her is... how is she going to apply for a green card assuming she gets the bar waived? She needs a viable path to a GC before going that route.