I think she will leave the religion.
But you dont want her to think YOU drove (or lead) her out of it.
Arrange for some distance between you.
She will probably date or even marry young and marry someone equally young who is a JW, be unhappy and then divorce. That will probably be when she leaves the religion.
After this (this is going to take 2 to 3 years) if the two of you stlll have an attraction to one another, see what develops.
How do I know this and why did I list each sentence as a "step"?
Because this is a predictable pattern among young witness girls who feel torn between their fathers position and a religion they dont want as there own. I have seen it over and over.
Wishing you all the best Patrickday.