I don't see any problem with saying, "I need someone who will not give up on me and will work to assist me so that I can NOT sabotage therapy. I have ideas on what would help me do this. . ." I think everyone does unconscious stuff that looks like sabotage to us.

If you have ideas that would help her help you, by all means tell her what they are! Together you can think of ways to make it "fun" to come to therapy so you won't skip, like kids that really like going to school? Talking about the subject right away, you can see how willing she is to "play"/help you with this problem you feel you are having. Sometimes just having my T and I both "knowing" something helped because she could remind me when I tried to get away with an action that wasn't in my best interest.