It's not entirely wrong, but it is retarded. If she can't stand to be with him, what the fuck is the holdup? She's not fucking married, she doesn't have kids with him (as far as I have been made aware) and she's barely 25% of the way through her life. What in the name of crap is so important about clinging to the last thin threads of an unfulfilling relationship when you're still a fucking child?

Tell her to get her shit in gear (nicer than that, however) and drop his ass. She's got her whole life ahead of her, and probably a dozen more guys to date before she finds Mr. Right. She doesn't need to be wasting her energy and willpower on fighting for a relationship in her teens.

If she doesn't get her shit in gear, either sit back and wait like a good pup, or tell her to get fucked. Don't waste your time agonizing over a relationship at your age. There's plenty more to come.