Relating to the physical side I'll be the negative voice...
I would say it is normal (esp if you are in a home where there is non biologically related male - according to some research.)
I was this kid, although closer to 9 years old. I was VERY aware of what was going on as well. I was exceptionally fortunate that I was goofy looking, had found myself surrounded by shy boys my own age, and responsible non molestery type adults as I would have been easy pickings. I wasn't lonely just very curious. I also had terrible self esteem and used male attention to improve my self perception.
I would say just keep a close eye on your DD's friends, and self esteem. I believe if you keep her feeling good about herself she will have the ability to make the right decisions about her body. She's going to be interested when she's ready. I guess your job is to keep that interest in an appropriate format for your family.
My parents were oblivious and would have described me as you describe your daughter, FWIW I didn't "mature" until I was over 13.
Last edited by Mahagogo5; 12/06/14 10:18 PM.