what's exactly bugging you? you're just wondering why she did it? do you like the girl who kissed you? how long have you guys been hanging out for?
how close are you with the friend that you work with? +1 to what Dino said. if they are best friends, the one you work with will already know for sure.
there's a chance she likes you, based on the fact she pulled back after the kiss and didn't ravage you like an animal in heat.
in my experience, if you're gonna jump someone under the pretense that you're "drunk" you just go for it. you don't hesitate because after all, you're "too drunk" to think twice.
bring it up, but don't make it a big deal. it's a just a kiss, she didn't grab your D and get aggressive so be nice about it