((((((biiv))))) I understand this so well. When I saw my t the first time after I had last cut (and got stitches and went in hospital), she was angry. I felt so horrible, but I know she was right to be mad, or at least frustrated. I think your t is just frustrated. She wants you to do better. It's a reflection on them I guess. I think it really means they really care, they want so much for us to get better.
And, I agree about writing things for her to read. I do this and it helps alot. Some things I just can't say out loud.
Best wishes to you!