There are things you can help, and things you can't, Hodgepodge. And right now you're trying to do damage control on the things you can't do anything about, namely your girlfriend, her feelings, her mother's feelings, and all the other crap she's dealing with right now. That's completely out of your control and you shouldn't prioritise worrying about it. At the same time, your anxiety is not your girlfriend's responsibility, and while it's perfectly okay to discuss it, I wonder if maybe you're expecting too much from her. You definitely do need support for your anxiety, but she's not the professional support you need right now, and clearly the whole thing is stressing her out.

However, you can do something about the anxiety. And while I'm not advocating for you and your girlfriend to break up, I feel that a short period of distance is probably not the worst thing that could happen right now. It gives her time to deal with the crap on her plate, and for you to deal with the crap on yours. Because together, neither of you is helping the other at the moment, just burdening each other with some pretty heavy issues. Clearly, something needs to change before you get back together again, and while you have no control over what your girlfriend does, you CAN control your own life and get on the road to recovery.

Figure out whatever it is you need to do to get to a better place, and decide to do it. Once you're there, message her and see how it goes.