This is sounding a little familiar to me with a DD with some similar issues and of a similar age. It's not as intense, and she still wants to to socialize, but I'm seeing a lot of just sitting around when she's at home. She's not even reading much, or if she is, she's flipping through magazines or looking at nonlinear books without really engaging. She has always been a very creatively active person, so I find it a bit sad to see. I have been guessing that the process of adolescing is sort of taking up energy or something.