Wait til she's sober and see if she remembers.

It can get complicated though, if two friends try to date and it doesn't work out, there's a big chance it would get awkward and the friendship wouldn't be the same anymore. Depends on how much you two are into each other and how much risk you're willing to take.
I've dated two people I was friends with first. The first one, after we stopped dating we never really went back to being friends, I only saw him a few more times after and then we never spoke again. Partly since the reason we broke up was because he wanted to get back together with his ex, but yeah. The second one is my husband, so obviously that one worked out.