I am a new PUA, but here is my take. Perhaps you were too goofy. Humor is good, and so is childlike regression. But too much of it becomes goofy which is a turn off.

Also it sounds like you were too cold to HB slut. Yes you had the power, but maybe you had too much. It seems like you didn't put in enough time with her. No one wants to be the girl you settle for at the end of the night. Remember, every girl wants to believe that you could have had any girl at the party, but that SHE was the one you picked. The fact that you did not leave with her may have made think that you were not into her. Obviously its difficult with an HB, its a fine line, but you have to walk that line between giving them your attention and acting like you don't give a shit.

I would have interacted with her more during the party. Worked some nearby sets, perhaps brought her into a few. DHV, make everyone think you are awesome, funny, etc. Perhaps brought the girl who you made out with back to meet HBslut to create jealousy. But drop her for HBslut once you had her number.

Anyhow, my two cents.