Bad advice to squeal on her on so many level's. Number one it would violate any affection or trust she has for you Drwho.
#2. She would be interrogated by a three Elder committee in what the JW's call a Judicial committee who's sole purpose is to keep the congregation clean.
#3 Before they reach that decision they will ask to hear all the intimate details of your making out session(s) including who touched what. Was there licking or sucking. Questions like were you on a bed, sitting or standing up. Nude, what was off and what was covered up.
#4. They will question her for a good hour and she will be totally destroyed after the judicial is over. It takes a good hour because these uneducated Elders will enjoy the intimate details and their power over her. You will be the witness sited.
#5 She will either be 'marked' and the entire congregation will know about her private business or Disfellowshiped (excommunicated in the Catholic church) and the Elders will share the details with their wives and fellow Elders and what she engaged in will leak out.
#6 She will be shunned by all of her friends, all JW's where ever she lives and all family members including her Son's and their families.
Being Disfellowshiped is viewed as a death sentence.
You would have caused her one of the greatest hurts for a JW.
So what's on the up side.....nothing.
You can get married........ there are mixed couples in the JW world but she will get a cool reception from family and friends. That may ease or cause her to wake up.