What would it mean or be involved for you to work with her on making it a safer space for you? Is that a possibility.

I understand her wanting to see how it goes before giving you an answer about prorating sessions because she may want you to face your fear. Could your bolting become a problem when you have to deal with other difficult issues in session? I know I wanted to bolt several times to the restroom or my car several times. I’m not saying you would do this I am just raising it as a possibility. When the weather permits can you walk or sit outside?

It does sound like she is willing to work with you which is rare compared to many others that post here.