I know how this feels, I've been there and it's so difficult and frustrating.

I told my T I had so much to say but couldn't find it somehow.
T told me to write it down...so I did.
I sent it via email and it was like an essay!
She read all of it and gave me a thorough response. At the next session she brought up the email and I sank back into the chair, she could see how uncomfortable it made me and left it.

It took me a while to form the email but I felt so much better for getting it out and having T respond.
Maybe you could tell her about how you're feeling and ask if she would be open to you emailing her or writing her a letter?

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