My Mom was a serial dater of " Worldly " men in her 30's and 40's. She was looking for a husband but also looking for someone who would convert to JWs. All were well off. None would convert.
She played the game your friend is playing. She was seemingly Spiritually Weak yet went out in service every Saturday and to every meeting. We were gossiped about because of her dating practices and ended up being shunned because of her behavior. She got DFd for fornication for her one lapse and had sex with one of her boyfriends-1 time. She confessed the whole thing to me-I was 15! Long story.
She lost all her friends and learned you don't leave the JWs without painful repurcussions. She got reinstated and never lapsed and never dated again. She is now a complete JW robot who is gleefully waiting for Armageddon and Jehovah to annihilate billions of people.
Your friend is not looking for rescue-she's looking for a convert.
Please stop trying to get her out. It's a waste of time. When a cult member is in, only they can get out. They have to make the effort to see the light.