if you had a daugther, how would you separate her from this church and not really choose a religion for her, but bring her back into her loving family.
My dad is a witness and raised us in the religion. My mom never agreed. My dad was hospitalized when my younger sister was 16 and so my sister had to move back with my mom until that situation was ended. My mom didn't want my sister to go to the meetings so my sister threatened to run away and hide with various witnesses if my mom wouldn't let her attend. The agreement they came to was that my mom would let her attend meetings if my sister would see a therapist.
My mom talked to the therapist beforehand and explained that she felt my sister was brainwashed and in a cult. The therapist said she had never heard any such thing about the witnesses and felt my mom was probably overreacting, but agreed to sit down with my sister to assess the situation. After an hour with my sister the therapist asked to speak with my mom again. The therapist said my mom was absolutely right... and at that point there was nothing my mom could do about it. Trying to pry my sister away from her faith was only going to push her further and further away. The therapist's advice was to try to keep the peace, remain as close as possible, and maintain a bond so that if my sister ever got to the point where she wanted out she had that relationship as a lifeline.
That being said, my sister was raised in the religion, I gather your daughter was not. My sister had been indoctrinated for many, many years. I don't know the situation with your daughter. I think giving you advice is premature without knowing just how long your daughter has studied or how far in she is. If she is already fully indoctrinated, for lack of a better term, my advice is the same as the therapist's. However, if she is newly studying and just now starting to cut off holidays and family time then perhaps she would be more open to you showing her some of the errors, fallacies, manipulations, etc. that are so prevalent within the organization. However, you have to be careful in how you do it. She has been told that her family and friends will object and that this is the persecution they face for having the truth... so tread lightly or you are only proving an obvious prediction they have already made.
It's a tough tightrope to walk, and I wish you all the best with it. I hope you find some way to get her out before she becomes too entrenched.
Best of luck,
Jackie