Wow, OP, have you even tried listening to yourself or reading what you posted?
It's really confusing/conflicting.
You and this chick apparently hate each other very much. And you don't want anything to do with her so why do you want to know so badly whether or not you are on her AIM list? Me thinks that you hope you are on her AIM list b/c in the off chance that it is, you will miscontrue that as another chance that you and her will get together or something.
Nik is right, you have feelings for this girl yet you consistenly deny it. However, your ultra defensive, hostile attitude clearly shows that you want exactly the opposite of what you're posting here.
Either forget about this girl and stop saying "im curious if i'm on her AIM", or just confess that you have feelings for her and IM her or call her to talk to her.
And you two are 18 and 21 in college? LOL you sure act like 14 year olds. I can't believe you take AIM so seriously.