Hello. Welcome to PC. I'm sorry you're having such a tough time with your mom. Here at Psych Central we can't diagnose people but I believe you and I would agree that she is a pathological liar for starters but what's more important is that she is toxic to you. There is nothing wrong with being 30 something and being at your mom's but you need to limit your exposure to her for the sake of your mental health.

Leave when you can. If you need disability, make sure you will be the one receiving it and not her in any way, shape or form unless she is a caregiver for you. Hopefully, other posters will weigh in. My heart goes out to you. Sending big hugs.