Is it normal to get mad at this?

I'm a male college freshmen and me and my friends decided to go meet up at Chicago during this winter break before the break started. as I've never been to Chicago before, I really wanted it to be something and I started to plan things out.

however, no one really texted me and this one girl who I like more than as a friend texted me time to time, but would never really have conversation about anything. and two days ago, one of my friend texted that he was food poisoned that he couldn't text me and cannot go to Chicago because his family visited. so I thought I can't really do anything and said its fine.

but the girl... yesterday at 9 AM, I texted her about what he said and later, I told her I already bought the ticket to Chicago and asked her what she thinks about it (since she lives closest, an hour drive, I thought there was no reason for her not to come just because other friends can't come, since it was more like seeing each other and hanging out). and as a response from her at 7PM, she said she's meeting with her quadmate that she can't come. that made me mad because I told every one of my friends exact date we are going and the day before she finds out that guy can't come, she already has appointment with her quadmate? that made me think she wasn't going to come in first place and had appointment with her quadmate. I got mad and asked her if she even planned on coming to Chicago and she replied that since everyone's not going she assumed the trip was off.

am I over reacting over this? I mean I planned this day, we find out everything went wrong on the day before the day, and she already has plan for herself on the day we were supposed to meet up. I'm sick of everyone letting me down like this every time I try to do something. I'm losing trust on everybody.. is it normal that I got mad at her?