Why does this crazy girl always mess with me everytime?

I go to this college like class and basically im very quiet guy, its a small class and i dont have no one to talk to really, infact everyone is quiet there, they just seem to talk to each other now and then. So there are two girls who are best friends, one of the girl is quite stupid and messes with me, she says im a cool guy and that and im her husband, i just smile pretending to be ajoke, she tells people that we both will get married, i mean its weird, we had a new teacher and she was telling her this and then the other day in front entrance she called two of her friends and when i walk pass her she was again telling them that im her husband, i think she basically is attention seeker. I dont really like her because outside of this college, my friends know her and tell me that she is a just sket.