You can be supportive with saying “I told you so.” It’s like telling a friend you have doubts about someone they’re seeing: “Look, I know you love Z, but you don’t seem very happy and I haven’t seen him treat you like you deserve, so I just wanted to express my concern and see if you were okay. I’m here for you.” Adjust for therapist.

Since it seems you know therapists in your area, could you recommend another therapist to your friend?

(Oh, and to answer your question, yes, it seems like something is off, as best I can tell from third-hand information.)