Could possibly be buyer's remorse, where things escalated far too quickly without enough comfort building. See, she may have been drunk and thinking that next time she sees you, you are going to expect her to make out with you and get all steamy again and that might put her off. This is just a possible theory from my personal experience as I had buyer's remorse a lot when I first started learning and had a lot of flakes due to it.

Maybe invite her out for some low pressure activity, and even say "Hey I'm meeting some friends later but I have a couple of hours free if you wanted to hang out" or something like that. It will remove the pressure of her having to spend a lot of time in your company and the pressure of things getting hot and steamy. Don't make it seem like a date.

One thing I learned to do to avoid buyer's remorse, is that if I sense things are escalating too quickly, I'll stop and tell her we need to slow it down and then I'll go to somewhere quiet we can talk and get to know one another and build comfort and a connection.

Or maybe her friend likes you and is jealous, or talked her out of it or maybe she has a boyfriend or something. There's myriad possibilities.

It won't definitely work, no. There's a chance but to me it sounds like you might want to move on or at least stop fixating on this one girl if you are starting to do that.

If you do bump into her again, make no mention of her ignoring you and don't be negative or sulky, just be fun and interesting. It's needy to ask her why she ignored you or make a big deal of it.

About a year ago I had a major one-itis and I screwed it up. As this was the story of my life so far I thought "Fuck this" and decided to take action and do something about a part of my life that was so far causing me insecurity and unhappiness.

Fast forward a year and I am by no means a PUA, more like a rAFC, but I am the happiest I have ever been in my life.

I still need to work on my approach anxiety, its pretty bad and definitely effects my abundance, but I am making progress

This forum is awesome though, some very wise people on here.