Is she angry? FB chat or in person?

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I'm a senior and she's a freshman in the class I ta for. For the first couple weeks of school we always smiled and glanced at each other. We have never talked to each other. Last week I added her as a friend on facebook and she accepted even though we have never spoken. This whole week I still haven't talked to her. I was going to after class today but some other girl hugged me and I think she saw. Anyways do you think she is still interested in me? or pissed off that I won't make a move?I tell myself everyday I will talk to her after class, but I can never walk up and talk to her. Should I start a chat with her on facebook, or would that be weird since we have never talked. I know if we chat on fb it would be easier to talk in person. Almost everyday we walk by each other and I just can't talk to her, I'm scared which is rare for me. What would i say in the chat anyways? I'm too scared to talk to you lol. Anyways should I start a fb chat or continue to try to talk in person?