Is this concert invite a date?

I have a girl who I've been friends with for over a year now and we have the same friend group. About a year ago, I asked her to come to an event with me and she said yes. Then she cancelled last minute and I took that as a sign that she wasn't interested in me. A few weeks later, she starts dating someone else which confirmed in my mind she didn't really like me romantically.

She broke up with that guy a few months ago. And ever since then, the few times we've hung out, I thought there was a spark. I haven't seen her in person in a while, and recently out of nowhere she texts me asking me if I'd like to go to a concert with her. After I say yes, she buys the tickets, and it's only us two going. That surprised me, because I thought some of our other friends might be coming too. But no, it's just us.

Am I crazy for thinking there's some potential romantic interest here? I normally wouldn't think so, but I'm struggling why she would only invite me to this concert, when we have a big friend group with people who probably like the music artist more than I do. And she knows I liked her in the past, so why invite only me? Any help or advice would be greatly appreciated.

P.S. I do wanna preface we've gotten dinner and drinks one on one multiple times before. I think it's fair to say that at some point there was romantic interest on both our ends for a short time, but it didn't work out. That's why I'm so confused as to why this is happening now.