I think, if you are there to do the work then it shouldn't matter if the therapist likes other clients more than you. Maybe she does. I am not here to tell you if it's a perception or reality. There is no way for anyone to know that. It's not that she might like someone else better, it's the fact that it upsets you that you need to pay attention to. If your healing becomes dependent on being your therapist's favorite, you won't be able to make much progress.