Hi, not erratic at all!! And if I'm misinterpreting you can always blame me for erratic thinking anyway instead of your posting. I don't mind, who knows!! No-one's perfect!!
But that "confused thrashing around in" your "mind" I'd say just let it out!!
If it's saying "I don't know about....", ".......feels wrong", "Wait, this feels uncomfortable, I don't know why, but........" whatever, it's still important.
So just give it some words then maybe you and your therapist can work towards figuring it out a bit more, getting to the bottom of your concerns/feelings, and finding a solution you're both happy with.
You don't have to be completely "textbook" in your concerns/"arguments"/debates do you? Afterall feelings aren't always "textbook" are they? And it's her job to be helping you in working through them. Put them out there, they matter!! All part of therapy!!
And if she learns to realize that you need a little more input about tasks then maybe she can adjust your sessions a little to accommodate for that.....move them forward in the sessions. Then again, nothing wrong with you asking for that anyway.
And nothing wrong with you intervening on her "rabbiting" e.g. saying "I know......" and elaborate, or saying "I'm sorry, but I'm just loosing the point/the thread a bit there". If it's not helping then she does kind of need to know.
Therapists can/should be good at adjusting their communication to the needs of whoever they're talking to, so just let her know "where you're coming from". You may still get a bit of "rabbiting" if that's "just her" just "her style" but if you can find a "middle ground" where her "rabbiting" could also be a little useful, along with the rest that would be good, right?
But good on you with being upfront with her in the past!!! Just a little more of that, hey? And hopefully she'll adjust her approach to you both getting through it together.
You've got a commitment to trying to make this work, right? That's all that matters!!
Best wishes
Alison