...teens are much more likely to listen to their friends than to their parents

Not necessarily. I'm finding I might have an odd relationship with my parents, but my parents' advice almost always topped that of my friends, as they had more experience in matters. (And can you blame Hermione for not listening to Harry and Ron 90% of the time? ;-)

And perhaps her or her parents' logic might go out the window, but she didn't seem to be suffering a major loss of logic skillz at the beginning of the book...