I am a big fan of Dr. Marc Weissbluth when it comes to info on childrens' sleep needs. Does it take your daughter longer than 45mins to fall asleep? Is she waking up during the night and having a hard time going back to sleep? If she is waking up tired in the morning then I wouldn't give her a later bedtime as she will wakeup even more tired. The problem we face as parents is not all children require the same amount of sleep and making sure each child gets enough sleep is hard. It goes back to needs verses wants. I don't think 8pm is too early for an eleven yr old, and as she hits early teens she may need even more sleep! It sounds like you are doing great with meeting her sleep needs. Don't give in to her pressure. Just because her friends stay up later doesn't mean it is best for them, nor does it mean it is what's best for her. Keep up the good work!