Girl's Behavior

Soo I am trying to move on from this girl and focus on others, but in return she has been acting strange. Why is she behaving like this with me?

There is this girl who I have a history with. She use to harass me on my facebook saying things like 'you have no taste in music,' 'Q#$#DDWED :P' She also insulted me in my face. I cursed her out and then she had me blocked on facebook for a while. She later unblocked me and then I blocked her back. Later I tried reaching out to her on facebook asking to talk and adding her and she didn't allow me to add her and didn't respond to my messages. I just wanted to clear the air, but clearly it didn't like she wanted to.

I later saw her at this party for occurred on 2 different days. The first day she ignored me, but she sat at the same table where my brother and sister in law were. She was sitting there and talking to them. I didn't give her any attention. She later wanted to take a picture of the group, but I didn't want to be in the picture she was taking. I later saw afterwards she looked at me and just looked upset.

The next day, when she was about to sit at a table, she saw I was sitting at the same table and got up and sat somewhere else. The rest of the party I enjoyed myself but towards the end, I saw her looking at me and looked upset.

I mean why is she like this? I tried moving on not caring about her, but I get these mixed messages. What does she thinks of me?
Soo I am trying to move on from this girl and focus on others, but in return she has been acting strange. Why is she behaving like this with me?
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