Sorry to hear your difficulties agnostic now - welcome to the forum. You will get lots of good advice here.
My twopenneth is for you and your partner to not criticise her mother in front of her however twisted she behaves; do all you can to guide and build her relationship with you (not being lax and soft but give her alternative goal ideas that match her true self away from jw land).
Is your daughter baptised? If not then I would try to persuade her to think long and hard before doing so and make it known that you feel she shouldn't be baptised as a minor.
Get well clued up on jw doctrine and how to cast doubt on it by using genuine thoughtful questions with your daughter using only the Bible and jw publications in a calm and reasoning manner.