CRAPPY friend. What do I do now?

During an angry drunken rant on my birthday, I went on and on about how shady my close friend was since she decided to tend to her boyfriend who had the flu over attending my birthday party. I thought that was a convenient excuse. I was insulted, but did not disclose my displeasure, but nonetheless the "goose makes you loose---" at least my mouth anyway, and i went off about her and her boyfriend (whom I never met) to a group of friends. Needless to say, I said some horrible things about her and her boyfriend. Since KARMA is a big ******, 8 months later, she "overhears" this information randomly at a bar from people she doesn't even know. i'm not sure if she actually "overheard" it or a mutual friend of a friend actually told her. Nonetheless, I opened my big mouth and now she's visibly upset with me. Good going, buddy...I apologized, but what do I do now?