Hi and Welcome to the board!
First,remind her that you don't hate jehovah's witnesses,the vast majority of them are good people;your issue is with some of their teachings that lack biblical backing.Where does the bible say that God has an organization on earth today,that the FDS was established in 33 CE and again in 1919,that the heavenly calling ended in 1935,that Jesus returned invisibly in 1874,and again invisibly in 1914,that christ is mediator only for the 144000 (less than 8800 people on earth today),that Jerusalem was destroyed in 607 BCE,that christian men cannot grow beards,that you have to fill out a service report every month,that you have to go to 5 meetings every week or run the chance of dying at Armaggeddon?
Those are all part of the jw belief system,which they say are based on the bible.Therefore these questions should be easily answered using only the bible.maybe you can use some of that to make her reason and question the religion.A religion that teaches lies cannot be true.WT 91 12/1 p.7
I hope this helps,but keep in mind many are still in denial and living the jw honeymoon when they're at the point where this person is.You have a battle ahead of you but give it all you got.
Goldminer