She’s 21.
As for why I want to rectify things, it’s simply because I hate to be mad at people and have them mad at me, especially for a silly situation that could be cleared up through some talk. I’m through thinking anything romantic about her, but while she’s in town, it’d be cool if my roomate, her and I could hang out. Now, I just think my roomate should hang out with her and I should find something more fun to do.
EER, I must tell you that one of my relationships ended because the fella told me (jokingly?) to “Shut the fuck up.” (I was not officially the one to end it, but I pulled the Silent Treatment like a champ–waiting for that apology, don’t you know–and he eventually dumped me.)
Gotta be careful what you say.
That said, I’m with PunditLisa, especially now that you have apologized and tried to make amends (and she still seems determined to play games). She sounds, erm… complicated.
Isn’t that normal? 
Seriously though, Elvis, I’d stop trying to revisit the conversation totally. The situation is just going to get worse if you keep harping on it, and then not only will you not get her in bed again, you may lose her as a friend. As much as you may want to talk it out, she obviously isn’t interested in discussing it. I’ve made the mistake of pushing conversations like this several times in the past before I figured it out.
Next time you talk to her, just say something like: “Hey, let’s start over and go do such-and-such.” See what happens.
If it doesn’t work out, chalk it up as learning experience. Hint: “shut up” and “get out” aren’t the sexiest thing you could say in bed. 