A girl I study with always embares me on purpose. Help?

For example, the lecturer asked her what answer she got for question 3, and she didn't know the answer. So this is what she did - she looked at me and called my name 'a, what do you think?' in front of the whole cl. She totaly put me on the spot, when initially she was the one who got asked the question.Whenever she is in a difficult situation, she totaly draws all the attention to me, so that I get so embarred. She is so sly, I don't know how to be sly with her back. I just want to teach her that I am not someone who should be abused the I get abused by her sometimes. She puts me down, and I want to let her know that she can't kep doing it. Although I feel uncomfortable speaking to her directly about this. Do you guys have any ideas please? Thanks for you time people, I really appreciate it.