Re: Blackout hookup with an old friend
I would try and set up something first in a group setting (Hey, some buddies and I are going to see a movie, you should come with. I'll pick you up at 8.) to reestablish the friendship part. She probably thinks you have feelings for her since you have told her in the past that you do. So probably the most important thing is to reestablish that you are just friends (Think of it as you friendzoning her). From there, just transition things to how they were before.
I've had this happen to me before too. I wasn't blacked out but I hooked up with a friend while we were both pretty drunk. Things were awkard at first but if you just go back to acting how things were before you'll regain the comfort with her.
You are the prize. She needs to earn it.