Unlike previous pp, I don't think the therapist sounds bad at all, at least from what you describe, OP. It sounds like she has asked what you would like to talk about, which is a way of trying to make you feel more at ease. Therapists often just sit in silence and wait for the client to begin, so the fact that she's asked you what you would like shows warmth, at least, I'd feel that (of course everyone's different).
It sounds like she has suggested something to focus on (the irritation you mention), when you were feeling overwhelmed by having so much you didn't know where to start. Then she's suggested looking at your responses to that over the last week. That sounds like she's taken on board what you said you wanted (to look at how your choices are influenced by past abuse) and is opening things up so you can focus on a current irritation and how your responses are influenced by your past?
Of course, if you don't find that helpful or relevant, then that's fair enough (because it's true you know better than anyone else what works for you, although it sounds like the therapist was a bit cryptic when she said you're the expert — she could have said what that means for the therapy).
Do you feel you're waffling rather than talking about what's important to you? Would more questions about what you're saying be helpful to you? Or focusing in on one aspect, rather than the session involving you saying lots of things but not in much depth? Or are you waffling about one or two things in depth?
When I had therapy years ago, I felt like I was just waffling each session, explaining my childhood and other experiences, but not getting much in response. In retrospect, I think the therapists I saw might have assumed it was a rare chance for me to have a space to express it all (as that's one main purpose of therapy, but just one of many), when actually I was tired of telling my experiences over and over to people and really wanted some explanation of why I felt so awful!