My best friends girlfriend has an apartment living with 3 other girls. Last year they had a party and one of her roommates was being a total bitch to me. Lets call her HB8.
Then...

yesterday me and my friend went to a bar and after ended up going to his girlfriends house because he wanted to meet her. We were there for only 30 mins. It was me, my friend, his girlfriend and HB7. HB 7 went outside to smoke some weed and i wanted in so i went outside too. As we were just outside smoking and chit chatting HB8 (the preevious bitch from last year) came out to join the sesh. As we were smoking for a bit i said to her, "hey werent you the girl who was being so rude to me last year at that party". her response was just the OMG i dont remember that i was so drunk im sorry... I then said its you are being nice now in letting me smoke you and your roomates weed and i just laughed and said its okay i forgive you. After that throughout the night she was being really nice and talkative with me.

DID I SAY THE RIGHT THING? Should i have been so quick to forgive her or negged her more? I am definately going to see her next time im at that house.. what should i say then?? Im startng to get into pickup and help would be appreciated!

Just run normal game, maybe slightly more. You don't wanna come off as if your feelings were hurt when she was rude, and therefor negging her constantly.