Hmm ... I completely understand where you are coming from, but if you would like some input from someone a bit younger, here it is. (I'm 19 by the way).

I think, that if you're daughter is showing improvements from seeing this therapist, then why interfere with something thats already working? Just because her grades etc seem to be improving, doesn't mean that there isn't any more "work" to be done.

I built a very close relationship with my T and expressed to my mother a little bit about our relationship. As soon as i did, i could see her kick into "defensive mode" because I think that she too was uncomfortable with the fact that i had created such a close bond with another woman. But just because i did, doesn't mean that she became any less significant in my life. It doesn't mean that i no longer saw her as my mother, or that i loved her any less. For me, having my T in my life was a gift. She was another person i could trust, another outlet. And yes, maybe i told her some things that i wouldn't have necessarily told my mother, but to be quite honest, it was what i needed. And maybe you don't really like that your daughter doesn't share everything with you, but i think the important thing here is that she is sharing with someone.

I don't know how old your daughter is, or how close she is with her therapist, but, i really do believe that it is up to her whether or not she continues to see her. I'm sure she wouldn't be doing it if it were hurting her, and as you said her grades and behavior is improving. But i think that you need to realize, that you play a big part in this as well. Her therapist may be able to give her different suggestions, but you are her mother, and her improvement is also due to your guidance and support. So keep supporting her, and encouraging her to make her own decisions ... and this is one of them.

My relationship with my mother took a really hard blow when she started trying to control my actions. It was only once i was able to start to do things by my own choice that we were able to mend some of our differences.

I hope I was able to help a little bit,
Jacq