I think I would wait until she sobers up and see how she reacts to what she’s done.

If she’s mortified and apologises, then it could just be a one time mistake that will never be repeated.

However, if she minimises what she’s done and doesn’t take your feelings seriously… well that says to me that she isn’t trust worthy.

When I was younger, I made a similar mistake and kissed someone while drunk. When I woke up the next morning and realised what I’d done I was devastated. I told my partner, cried and apologised a lot. My partner forgave me. No, it’s not happened again (this was ten years ago). I am very trustworthy. I just got drunk and fucked up.

However, it’s completely up to you and your boundaries. If this is a deal breaker for you, then that’s perfectly fine.