my [28m] sister [16f] sister pretended to not know me in front of her friends (presumably because she was mad at me) and it got tense in public. What should I do?

My sister and I had planned to go to a nearby beach town. We had been talking about it for a while and she was excited. Initially we were going to go this weekend, but on Thursday suddenly we got a massive unexpected project at work with crazy overtime, so I sadly had to cancel.
Yesterday I went to our parents home for dinner and talked to her, apologized again and she was mad and being passive aggressive ("well since I have nothing to do this weekend I'm gonna stay at my friend's"). I wanted to honestly tell her I was sorry but she was being a bit of a brat about it so maybe later, right?
Earlier tonight (about 7pm) a co-worker and I went to a minimart for refreshments and she was just outside with two of her friends, skating nearby I think. I got close and said that I thought she would be back home by now. She looked at funny me and said, are you talking to me, freak?
I laughed awkwardly because she said it pretty loud and kinda stared at her waiting for her to laugh or tell me she was joking, but she didn't say anything and I said "are you for real", and her friend said "what TF do you want, weirdo?" real loud and a few people turned their heads.
I stood there a few seconds totally confused just looking at her but she didn't say anything. Her other friend stood up and I decided to go into the minimart, and one of them said, yeah walk away, *******, again pretty loud.
I got the stuff and walked out, I didn't even look in the direction they were in when leaving so I don't know if they left or not. Later I texted her what was that all about, other people could have thought I was harassing her and I could have gotten in trouble for no reason. She hasn't replied or even read the texts, but she's been active so she's just ignoring me I guess.
I assume this happened because she's still mad at me for cancelling the trip, but JFC. It wouldn't be the first time she acts out for not getting her way but I think this crossed a really hard ****ing line. I will most likely not have time to see her tomorrow. In the meantime should just wait for a text back or what?
I also don't know if maybe I'm exaggerating. I think I am not, but still would like to know.
Should I try to talk directly to her or our parents? Why TF would she do this?
tl;dr: Sister pretended to not know who I was when I talked to her in public (presumably because she was mad at me for cancelling a trip), insulted me and her friends seemingly thought I was harassing her. She isn't texting me back for an explanation. What should I do?


Source.