I've got a problem.....

So I need help. There is this girl from school that I met this year. Her name is Lacy. At the very beginning I thought pretty good about her but then things changed. She can be nice in all but she hurt my feelings badly!  I am crying my eyeballs out when she doesn't even realize what she has done to me! She thinks "Oh you know she probably didn't take that badly I'm going to go on with my life and not worry about it". I`m not going to go through all the details about what she has done but need I say more? I have another problem though, she wants me to come to her birthday party!!!! I mean I know I should be polite and nice but doesn't she understand that i just want to stay as far away from her as I can!!!! So can every one out there please comment to me and give me some advice on you know just how to deal with her but in a good way and maybe help her realize that maybe she needs to change about how she reacts to me and other people.


PS:Yeah she`s hurt my friends worse than she`s hurt me. So its like I'm trying to be nice to her but at the same time I don`t really want to be close friends with her because I`m afraid she may be a bad influence.


Please Help!!!