Sounds like you have a plan!
But just to echo what others have said - I think she sounds unprofessional, inconsistent and that is treating you badly. Therapists who operate a sliding scale *choose* to do so and, whatever fee the pair of you agree together, the therapist has decided that they are willing and able to work for that amount. It should therefore have no bearing on the service you receive - all clients are entitled to the same high level of respect, care, professionalism, consideration.
That said, this whole thing is weighing heavily on my mind at the moment as my therapist charges very high fees and for the past 2.5 years, someone else has pre-paid my therapy fees for me (long story, which I won't repeat here in your thread!) So I am now at the point of not feeling ready to finish but not being able to afford her either. She has talked vaguely about us working something out for months - and I believe that that is her intention - but my last paid-for session with her is next week and we still haven't discussed practicalities and her new fee. If she doesn't then come up with a radically reduced fee that she is prepared to keep seeing me for, I'm going to be totally stuck. Trying to trust that it won't come to that but I guess all will be revealed next week as we absolutely *have* to talk about it then!
Not meaning to hijack your thread by talking about myself. Just saying that I understand how money stuff can change things/impact the dynamic. I have already had my weekly session length reduced from 90 mins to 60 mins from the start of this year (we didn't discuss and agree this - she just sort of told me in an email and I didn't push back) and I am wondering if she'll suggest fortnightly sessions instead of weekly (very unhelpful speculation based on nothing my part!) And I've had the same time slot in the diary for the past year or so and, since the start of this year, suddenly I haven't as she's obviously given my previous 90 min slot to someone else and my new 60 min time presumably fits better for her at a different time. And now we are sorting out next week's session time at the end of each session. Again - we haven't discussed this. She has just done it and I haven't pushed back or commented on it. And I don't like it.
So, what I really mean is, I am already finding myself thinking that, whatever she offers me, I must be grateful for it and just accept it. So, the impact of the finances on the dynamic is already kicking in big time for me. And hopefully once we've agreed whatever we agree next week, the certainty around that plan will make me feel more secure and then I can ask for things like a set time every week again and I think she will agree to do that.
If I feel at any point though that I am being treated as "less than", not as important, a lesser priority etc, that's a different thing to my stuff about feeling bad about not paying her "properly". And maybe she is already showing me that by messing around with my session lengths and times. But I don't think that is what's happening. We will see...!
Anyway...sorry...that was way longer and way more about me than I intended!
I really just wanted to express that I understand how the dynamics can change, I understand how it can be hard for us to work with a reduced fee (even if the reduced fee is what we need to enable us to keep seeing them and doing the work!) and that, if a therapist has offered and agreed to a lower fee, it is not on at all for them to operate a sliding scale service in line with that.
Good luck!