In life and especially with teenagers you sometimes have to pick your battles.
The teenagers are not really that mature, thats why when they get that first bit of freedom in Israel they take advantage of it.
You have to look at the bigger picture, the girl in the story turned out OK and in the end thats all that really matters.
I just look upon it as a lesson in life.
This thread should not be a thread in Halacha as much as how to raise teenagers especially those who might have a little rebellion .
One can yell at the teenagers all day Assur M’Arysa and Koreis etc, some it will work and some it wont. For the ones that it wont, many times its just best to wait it out until it passes. And it seems in most cases it ends up just fine.