Is it normal for my daughter to obsess over her teacher

My daughter was in the 8th grade when she became obsessed with her teacher. She is a twin and was 13 at the time. I was pregnant at the time with my 3rd child. She told this teacher a lie to get attention from her. She told her she had been molested by a person that had already died. I was notified by the school I took her to therapy and the therapist thought her responses were "off" as I did. I can tell when she is lying I just couldn't figure out what she was lying about. I took her to a new therapist she was tested and I was told she is a genius and she continued to see him for a couple weeks then the doctor told me she would talk to me about what happened when she was ready and she didn't need to come back anymore. This second Doctor made it very clear to both me and my daughter he would not tell me what she and he discussed. . During all that time I found several letters my daughter wrote to this teacher. The letters were filled with horrible lies about how she is so mistreated by me and her family. I don't understand this I had believed we had a great relationship. She also lied about being mistreated at her dads. The story's were even written and rewritten as if they were being edited to be worse. The stuff she wrote was actually parts of a law and order we had watched. I actually confronted her about these letters and told her these letters could have gotten her and her sisters taken away from me and told her this had to stop. Well 1.5 years latter I find a letter she wrote me telling me that it was all not true and she just got caught up in the lie and didn't know how to fix it but she felt bad because she knew it hurt me. But she has had this letter written for several months now and has not given it to me. I want to tell her father about the letter that it wasn't true I want him to know I am not a horrible mother. I want to tell him that just a week or so before she told her teacher about the man that was already dead that had touched her I had told my daughter about my sister. My sister was molested as a child and my parents didn't find out until after the molester was dead and it drove my parents crazy that they couldn't get justice for my sister. Then a week later my daughter tells her teacher that she was in the exact same situation and tells stories exactly like law and order Svu. Also she is still writing crazy obsessed letters to this teacher she has only stopped putting in them that she is mistreated just that she misses her and wishes things weren't akward and wants to call her. I don't know what to do.