@Testament I'd tread a little carefully, TBH.
If this GM is socially awkward or has any sort of confidence issues, the girl sounds like the sort of strong-willed Yoko that could break up the band. Some people will sell their souls to strong-willed people. D&D is the companionship every few weeks. Girlfriend is daily. Advantage: girlfriend. Some of these people are just fine alienating their SOs friends until they get the person all to themselves.
My gaming group has had a few people being their SOs to game and it's mostly horrible to the point that we implemented a house rule: RPG TIME IS FOR RPG PLAYERS ONLY. Weve had my buddy's annoying girlfriends sewing while we play, reading, etc and making commentary while asking the players to stop so he could get her drinks. I've heard of a few groups where a girlfriend would hang out topless for attention to try to distract from game. SO wants to watch TV while we game? Fucking great, put on some headphones and don't chirp. Otherwise, they can go do something else.
Clearly this girlfriend (cant remember if you said shes playing or not) is doing a little bit of divide and conquer, here.
Other ideas to use house rules as a way to stop this stuff?
- House Rule: No politics or religion
- House Rule: Keep it IC. No coming after people for their personal lives.
The more you try to keep things clear that HER behavior is disruptive despite her hate of YOUR beliefs, the better off you'll be. This is a HER problem. Not a GM problem or a YOU problem. A "THIS SPECIFIC PERSON IS BEING RUDE AND AGGRESSIVE" problem.
She joined into THIS group, not the other way around.
But if you push too hard and if this GM is like: "zoinks, I'll never do better than this girl" your gaming group could be in jeopardy.