I feel for you in your situation. Through this whole thing, it seems like there are lots of situations that invite mind reading. Suddenly, you're back in high school again. "Does she like me? Will she go out with me? She looked at me, that means something, right?"
I know I'm pretty terrible at falling into that trap, but I would say take everything she does at face value and just be Cool Joe NewB3. Granted, sitting on your lap and laying her head on your shoulder would send all sorts of confusing messages to me, but still, play it cool.
As for Thanksgiving, my suggestion would be to ask yourself what you would want. Don't do it for her. If you would like to see her family and it won't be uncomfortable for you, then go. It's freaking turkey time and you just can't beat a good meal on Thanksgiving!
M:35 W:31 S: 9 D: 5 M: 11.5 yrs BD: 5/13 W moved out: 7/13