I think my friend takes advantage if me...?

I've known her for 8 years. We used to be really close, like inseparable, but now it's the exact opposite because we go to different schools now. I'm not trying to brag, but I'm smart for my age. Pre AP in everything, honor roll, and and I get good grades. She's... Well not so bright in school. So everytime she has a project for school, she comes over to my house and has me basically do it all for her, and she ends up getting an A. But then on Facebook, I see her posting tons if pictures of her and her new friends having so much fun at the mall, movies, bowling alley, etc. And it kinda makes me feel, well not jealous but angry. The reason is because she never does that stuff when I'm with her. I miss her. And by that I mean the old her. She used to be a no body at the school we used to go to together, and now my other friends that go to her school say that she's kinda popular. I don't know what's happening. What do i do? I feel... Left out I guess you can say.