Thank you everybody for your input!
She is currently not receiving any treatment for OCD, it's pretty mild and I found some coping skills for both of us that seem to be working well.

I think Zen Scanner nailed it. She really seems to need to observe everything and everybody before getting involved. She is extremely observant, can recall conversations word by word and seems to soak in and analize EVERYTHING, even things that don't involve her. I've never had to discipline or lecture her about anything, she just seems to know what is expected and I've always said that she's like an old lady trapped in little girls body.

But I feel bad for her. It seems she's not able to "let loose" and just be a kid. She has always been a worrier and concerned about things that kids shouldn't even think about and that from a very early age. So what do I do? I feel like since she's always doing what is expected and behaving perfectly, the teachers will never know what she's capable of and she will go for the rest of her academic life just blending in. She never asks for anything, never draws attention to herself, does what's expected and goes home. Am I worrying for no reason? Or should I push her out of her comfort zone before she turns into a total introver?