Drunk making out with my friend last night now I feel awful?

So I am guy and have known my friend for about 4 years. We used to hang out a lot but now we just hang out every once in a while. We have never had anything more then a friendship and that is all I have ever been interested in with her. So last night we went out and got fairly drunk and started making out in the club. Just kissing nothing else. We continued to drink more and then when we were outside waiting for our ride I went to kiss her and she backed up and admittedly I kept trying and when I went to hold her hand she got really upset and told me to back off which I did. She was a really upset and walked off. I followed her a bit and she just said she got really triggered. I called her and she hung up on me. So I called her in the morning and I left a voice mail, I apologized and told her how sorry I was and I meant no harm. Many years ago she was d and I know I probably triggered some of that stuff and I feel awful because I was drunk and didn't even think about that stuff. I don't care about anything else with her and we never should have kissed in the first place I do very much care about our friendship. She has not returned my calls and I have stopped trying to talk to her. Any advice on what I should do next?