Assuming she will leave before they physically force her to leave, she should make sure to keep available documentation to prove that she left on the given date. She should hand in the I-94 (if she still has one) before boarding the flight (keep a copy of it for her records), get her passport stamped when arriving in the home country, and keep the boarding passes. Because when it is time to interview for the GC at the consulate, they may ask her to prove that she left before the 180-day limit.
And report the lawyer to the bar association, AILA, and whoever else is relevant.