Thanks chicken little.
I wonder how JWs viewing this film would react. I think they'd be OK with it. In my opinion, the film doesn't demonize either side from their point of view. I could easily see them thinking how sad it was that she left the org, but she gets what she deserved. She dabbled with worldly people and this is the result. She was weak. And now she's lost her faith over a worldly boy and is going to die at Armageddon. It will be a lesson on bad associations and becoming unevenly yoked. The heros in the movie will be the father, the younger sister, and the elders.
In the end, while she is free from the JWs, I also think she was very naive. She's a 17-year-old JW and her friend describes her as a JW nerd. She probably never had a boyfriend. Then she falls in love with and moves in with the first guy who pays attention to her. And this guy is, as the film says "Worlds Apart" from her. How many people end up happily-ever-after with their first boyfriend or girlfriend? Usually you're just anxious as a teen to have somebody who cares about you, not to mention hormones. Whether or not you've got anything in common and are truly compatible is usually not going to stop you, but those issues are key to your future together.
The relationship she's forged with Teis will probably end. Now she's on her own. She's dropped out of high school. At least as of the end of the movie, she had no job. She hasn't got family support (maybe from her mother). It's going to be a rude awakening. It's also the kind of thing that has often drawn people back to the JWs. They leave to chase what they think is paradise and when it turns bad, they blame the dream they were chasing. They sometimes think "this is what the JWs warned me about in the world" and they come back repentent.
Don't get me wrong. Leaving the JWs is a good thing. Tying it to something that may very well be temporary can be trouble and may not keep her away from JWs.