Can you live with the down side?
If your daughter is successfully converted (and don't think it can't happen), you will likely never "see" your daughter again, at least in any meaningful way.
She will think Jesus is an angel, believe the governing body of JW's is God's sole channel of communication on earth, and adopt the hideous practice of shunning anyone questioning her beliefs.
You say you are a Christian. Then, be a good christian parent and read where the bible says to marry only in the Lord. That would include dating I'm sure. JW's are anti-christ.
Share everything with your daughter. Hopefully, it is not too late already. You did the right thing by asking former members what they think. There are many Ex-JW-Now-Christian groups on Facebook that you may want to check out as well. They are closed groups... no one can see you post there.
I was a 4th generation JW. Many in my family have had their lives destroyed by this nasty little cult. It took until age 40 to be completely mentally free. I had serious doubts since age 13.
Don't do this to your daughter. You have a legal, ethical, moral and Christian duty to address this head on. Having a do-nothing attitude is the same as doing all these things to your daughter yourself. She is blinded by her emotions. You are not.
Here are some tools that I wrote that will help you to understand why JW's are not Christian. You can mostly forget about confronting JW's on their beliefs (like Jesus is not their Mediator). They will lie to your face without skipping a beat and claim just the opposite, although you can show them from their own publications that this is so. Their conscience is seared. They will do anything to protect church leadership, whom they idolize.
I will be praying for your daughter.
- Perry