I'll keep this simple.

So I messed up the first convo and didn't keep her interested. She has responded to a few texts though, but hasn't called me back and I called her last. Is this water under the bridge at this point, or is there a way to recover?

I'm getting better at phone conversations with random women. I wrote down like 50 topics on a piece of paper and when I call a girl, I just need to whip that out. Call her one more time if it's not happening then move on. What exactly did she say on the last conversation that has you discouraged? If she said anything negative to you or made fun of you then it's probably over. Did she try to take your manhood away from you? If so, that's their way of saying you lost.

Well she was Vietnamese, but she fooled me into thinking that she was Korean, so I neg'd her a little bit about fooling me. I was at the mall at the time, so I asked how much she shopped, and neg'd her, accusing her of being a shopoholic like most women. We talked a bit about clubs in the area, and where she'd been, and about the club she was going to that night. I told her she should rest up for tonight, and I had to go anyway. It was about 15 mins total.

After two weeks, when I thought it was over, she txt'd me asking if I wanted to party with her, at about 11pm and we met up, so this is a weird one.

if you ever get a chance to chill around this chik this is what you should do:
you gotta act as if your the prize and act like if she seems like nothing to you but only if you get to be around her again. you might have fucked it up a bit but at least you'll have a better chance with the next one....this might not be a precise anwser for what you were looking for but keep this in your mind next time.