they say you can't really control what your kids will and will not do - in the end, they are most influenced by their peers.
all you can attempt to control is their peer group.
so the question is - if your kid has taken up with a really questionable kid as her new best friend, thus has moved into a group of really unpleasant kids - how do you re-direct your kid?
i can't really leave nyc. if i forbid the friendship, it becomes - like romeo and juliet - still more compelling.