11 year olds have interests, I would believe that your daughter does too
Help her find it. Seriously reading or cooking, anything. Even music.
Have you asked what she would like to do in her spare time?
Quite often it's extra curricular activities that can help with personal development. Sports are good for special awareness too. You can't expect her entire development from sitting in a classroom.
Also, to that pointless comment about girls heads being full of *fluff* - you clearly know very little about teenage girls.
They always act one way and think another. These comments and feigned interests that lead people to misconceptions such as yours are usually there to allow for better peer interaction. I used to always wonder why the girls in my own year acted like well, idiots. It's an interaction thing. The same girls got straight As and Bs. I guess acting smart didn't suit their image.