HELP! I'm so confused and I don't know what to do?

Okay, so I'm a 100% straight female. In one of my classes, I overheard a girl talking about a gay couple she likes from an anime. Being a fan of that anime, I immediately started to talk to her about the show, and we talked about how cute that couple was. Yesterday, she started to talk to me, and she would keep tickling me. She even came up behind me and hugged me from the behind many times, and she also stroked my arms. This was extremely uncomfortable for me, and I squirmed around and told her nicely that it was weird. ("Ahhh sorry I'm not a huggy person..." "Stoooop") I don't know what to do, because I really don't like it. Is she flirting? How do I send her the message that I'm not interested?

Also, this girl and I barely knew each other. I just found out her name yesterday.

I'm pretty sure she's bisexual, because she was talking about how she wants a partner who'll watch anime with her, not a boyfriend or a girlfriend, but a partner. Is that a good indication?