So I'm on my college campus for the summer and recently had an encounter with a tinder date from last year.

Context: We matched on tinder, we were both looking for something casual and our intentions were clear. She was on her period that week unfortunately lol, but she said she'd like to grab coffee before doing anything anyway which was valid. We met up, and this was my first date in a long time since I'd been in a relationship, so I was nervous as hell and thought I blew it. Later, I actually got back with my recently broken up gf, so I didn't plan on texting her. But she shot me a text a couple days later asking to hangout which I found surprising. I didn't respond. A few months later, my ex and I broke up for good. I texted this girl but she didn't respond, which I thought was fair since I ghosted her the first time.

Fast forward to last week, I was getting some work done at the union and go into the student id card office since I lost mine, and I see her working the front desk. I didn't expect to see her, and I got nervous again lol. It was a little awkward but I kept it brief, asked about the info I needed and left. I just thought it was funny and didnt think anything else of it.

Yesterday, I'm in the union again, and she's working a different front desk which is next to the hallway. I was walking and we locked eyes for a solid 2-3 seconds, after which she smiled and I smiled back.

My question is do I pursue her. Does her smiling at me warrant me approaching her again, or was she doing it to avoid awkwardness?

I do have her number, but I'd feel like a pussy if I texted her instead of going up to her. On the other hand, I know I'm gonna be nervous as hell if I go up to her in person and I'm not even sure what to say. She's pretty attractive and borderline out of my league which makes it harder. Looking for some advice.