You lucky lucky BASTARD!!!
She probably didn't want her friends to feel left out and whatever (Good friend she is, she's a good girl KEEP HER!)
talk to her today, just be friendly, I'm pretty sure things will go smoothly, if you want you can pretend like nothing happened (Don't be awkward man, thats the last thing you should do) just be like (if you want) "By the way, I loved saturday, I hope we can do it again (that includes the day and the night)
If you're nice, I'm nice