I'm going to therapy for work related stress and my boss wants me to tell her what is discussed

[shouldaknownbetter]

That's not right is it - that she can demand I update her after I have my sessions.

I'm going because of her in the first place and her bullying management style.

Had a bad reaction to her underhand ways when she lied to me and betrayed my trust which ended up in me being so upset I had to go on diazepam. As I drive for my job, I had to tell her so that I could avoid driving for the week I was on diazepam.

I have arranged for private therapy myself to better deal with the emotions she elicits in me, but asked to do this during work time.

She's basically said yes but she wants me to tell her what I'm doing it for, what I am going to get out of it and can I update her when we have our one to ones.

Surely it's private and telling her about what I've discussed with the therapist about her isn't going to make me any less stressed!

Feel like she is placing demands on allowing me to access this treatment now.

well yes in theory FB45.. but who is going to hold them to account?

I say this as a HR professional who a previous employer tried to make redundant when she was pregnant! (although I managed to reverse the decision on appeal. ... there was not sufficient justification for the decision as redundancy of pregnant employees should pretty much be a decision when they are no other viable options)
Cobblers children and all that....

Imagine you have "shoulda" as an employee who needs advice.
What would you be saying to her/him? Then do that.

(I assume you'd at least tell them not to give any private info to their bullying boss.)