This happened to me before when I was 21 or so, with a group of friends I grew up with thru high school and college. They invited me over under the guise of a party and ended up having some weird quasi-intervention over, of all things, beer league hockey. Basically telling me that I need to shut up and sit down and listen to them yell at me and not respond. I realized, too, they all talked shit behind my back, in particular one guy. It was easy to tell cause they would talk shit about whoever wasn't there for the most part. Now, six years later, I went on to move to a whole other state by myself and make new friends who don't resort to such petty high school behavior, I have the best job I've had yet in my life, I'm in the best shape of my life, my depression is a lot more manageable, and I have an amazing, gorgeous partner who I'm very much in love with. Part of this growth came from cutting the cord. Seriously, my life has gotten exponentially better since then, and I know your girlfriend's life would too if she did the same thing.