Is this stalking????

I used to be friends with this girl when I was little, and now I'm not her friend. I hang out with more of the popular kids, and she hangs out with...the other kids. I don't talk to her, I don't even ociate with her anymore. She tries and talks to my brother about me, she went to my best friends house, sat in this chair in the kitchen and said to my friend 'When___(me) comes over, make her sit here', she Hacked on to my facebook, went on her wall and wrote 'i love you!!', we were at a banquet, and she grabbed the microphone and said '____I DO EXIST! STOP ACTING LIKE I DON'T!' In front of EVERYONE. She told my best friend she KISSED ME! And that's where I wanted to draw the line. Is this stalking? What should I do? I don't want to ociate with her at ALL.