[Eternal]

Sadly, you cannot make her want help. It sounds like her anxiety is really getting to her, and she probably at this point doesn't think that just talking about it will help any. I think it might be best to not press her to talk for now and instead wait and see if she opens up to you about it.
In the meantime, you could try and slowly get her to go outside more. You could suggest going for a walk together, perhaps somewhere quiet first and then move to more public areas.
I'm sure eventually she will realize how much her anxiety is affecting her life and will be ready to reach out for help. Until then, make sure she knows you're there for her, but on her own terms. She needs to feel comfortable before she will be willing to start fixing the problem.