What bothers me the most is that you went to her in the first place to deal with sexual abuse - why is the therapist sidetracking on definitions?!? I know you need to deal with background, etc. but this seems off topic and not helpful. This work is hard to do - much less with someone who wants to argue and get into power struggles. I sense she is somewhat intimidated about the co-therapist situation and may not be the best fit for you. Some therapists are just not a good fit, and it is ok to "interview" several people for the job before making a decision on who you go with. Just sayin...