((ECHOES))
I really hope that 2 things can happen for you:
1. I hope that during the next session you can explain to T that she has repeated the pattern of you not being heard and feeling unimportant. Although she did not do this maliciously, our T's do not always realize the stuff that affects us so much.
2. The decision is not set in stone. I hope you can tell her that you really think Thursday is a better day and would like to switch.
There are two parts to being heard. One is actually when you are giving a chance by the other person
to be heard and the other is when you can speak up for yourself.
Perhaps both things fell apart a bit in your last session, but they can be rectified.