Ennie, I can understand your frustration with your sister. Like others said though and you now know, you can't change her. You could certainly bring up the subject to her if you can find a way to communicate that gently, and in a way that might make her receptive, but I'm not sure you'd want to put her good standing with her therapist vs how you see her into that conversation. It would be more of a "you know, I noticed you don't treat people well but expect them to treat you well." (if that is even whats going on. I'm just guessing) But it sounds like maybe the best thing might be to just go about your business knowing that you are taking care of yourself, as well as not stirring the pot with her. You say she's toxic and you love and care about her. I can relate to this too. I try not to spend time around toxic people. But when they're family, that can complicate things. Do you have to be around her much?