Have I over reacted? should I be upset about her attending?

Let me break it down for you. It's kind of lame, so I am sorry if this is childlish.

I have been with my current GF for 6 months. I am living in a different country too. So although I had made a few friends, the past 6 months my social life has really taken off doing things with her and her friend group, who I am getting to know well.

So there is this big multi day festival, its super popular, everyone wants to go. And all of her friends are going. At the end of last year, she mentioned buying tickets. As I said, I am living in a different country, I wasn't aware of any of this sort of thing. I had no details, I kind of felt like I was just along for the ride.

Must have been NOV/DEC i said... Yeah I want to come, if you end up buying a ticket, get me one too and I will pay you back. It was all a bit up in the air at this point. It ended up selling out. She didn't mention any more about it. But it turns out she was like the only one in the friend group not to get a ticket.

Fast forward now. Me and her are the only ones without a ticket. But here's the thing. From the start she said, Im not going without you. I even thought I sourced a ticket, and I told her i would give it to her, they are your friends. She said nah we are in this together.

The festival is a couple weeks out. I have been trying really hard to find resales, actively messaging sellers and trying to get 2x tickets for us. She's done nothing and even stated "I have accepted we aren't going I am giving up" I kept trying.

In the background, a huge group of her girlfriends were looking for her. And bang, out of nowhere, her friend messages and says I got you a ticket. Which is great byt sparked some awkwardness. She said... we need to work out what we will do about you. What do you mean I said? She says well we only have one ticket, lets make a plan to get you one otherwise ill be going without you.

I was a bit like whaaaaat, ok sure. But what pissed me off is this. I have been doing all the heavy lifting looking for tix. She gave up and got one placed in her lap. She told me we are in this together, but as soon as she got a ticket, bailed on that idea and says shes going. Says lets make a plan for you, and proceeds to do nothing about it or mention it for the next 5 days. I told her all of this. That I don't have a team of friends around me looking.

It caused a legit argument. Even though I told her she should for sure go and have fun, but I'm a bit upset. For those reasons I motioned above. On a way deeper and more vulnerable level, I feel abandoned after what she said previously. And that her friends will look for her, but no one cares about me.

Whats the right thing to happen here?