Well, if you GF is not interested in getting a lawyer, and fighting, and would rather just keep paying to keep things quiet, I guess that's her (bad) decision.
After all, it's her life.
But I certainly appreciate your, and her parents', interest in helping her. She should seek a lawyer's assistance, as suggested above. I don't know jack about the law of your particular state, but there must be some sort of legal resolution out there. Perhaps she can get some sort of court order giving her sole occupancy of the home and the power to sell it, and so forth.
Be there or be square. Only I can do both!
I've got a cat named Beefeater and a dog named Beefeater, and two goldfish called Beefeater and Beefeater. There's Beefeater my hamster and Beefeater my horse, and my piglet, known as Beefeater of course.
Veteran of the Great Irisch Moos Campaign of 2008-09