Oh and as for the name thing, you'd be surprised how little you actually need to call someone by name. I know it's not great advice but I'd just wing it until either you remember or you hear her being called by her name or something.

If in the meantime, she cottons on to the fact you've forgotten her name, don't be apologetic, just be like "well to be fair, I was drunk and I figured I'd work it out sooner or later". She'll respect you for being honest and unapologetic.