I fortunately have a choice for therapists in my situation, and it took about 5 years and about 15 "first sessions" and probably 8 or so "ghosting a new therapist within 3-6 months".
So I understand that finding a person you 'click' with and you can trust takes hard work and emotional vulnerability.
Luckily you seem to like her and get along, it's just no trust ... yet.
I think you are standing in your own way and need to open up to start with about the anxiety over just being in a session. I think it may be you have high expectations and know the textbook, so to say, techniques and are waiting for them to fail as an excuse to not go the next step emotionally.

I'd say give it more time, and be open and honest about your current feelings, and know that she is not judging you. She is there to help.