My 28 Year Old Daughter Wants To Be A Boy.

My 28 year old daughter wants to be a boy. She wants testosterone , her breasts removed, her name changed legally. She is in a relationship with a boy who now is a trans girl. My daughter has been in therapy for 8 months and seeing a psychiatrist who has her on cymbalta. She is on blood pressure and thyroid meds. Where does this come from and can her mind be changed before she changes her body?