is this what they mean by the 'tween years?

I have already confessed to being a Guitar Hero family and we are sitting here at 9:55 am and it is 95 degrees outside so guess what we are doing? Yep, playing Guitar Hero. Not for much longer, we are about to go to the library. But while M was sitting there rocking out to Stevie Ray Vaughn's Pride and Joy she tells me we have to hurry up and get to the library so that she can get the Pooh Bear book she wants before someone else does. Is it just me or does that seem odd? Is this what they mean when they talk about the 'tween years? Trying to grow up, but still hanging on to being a little kid. I'm not ready for the grown up part - she is only starting 4th grade in a month. Well, she decided she is done so it is off to get some new books . . . apparently Pooh Bear books!