Did I miss my window?

So I’ve been recently interested in this girl at work from the hospital. We know each other for a while now but we barely see each other. We’re both nurses and she is fairly new like 7 months. She works on a different floor but she picks up on mine here and there because we have same manager plus she is AM while I am PM so it’s really hard to get an opportunity.

A week ago we finally got a chance to work both PM. I don’t wanna say I’m flirting with her because I’m bad at reading those type of atmosphere although admittedly my friends often say I flirt a lot with females when I only talk to them casually about topics in a discussion manner. Throughout the night, she asks me a lot of questions and help which turns into work-related small talks and I made her laugh PRETTY good (she put her head down the desk and laugh mildly hysterically) when I made a snide remark about one of our perverted patients. That being said, she is known to be really anxious about a lot of things at work granted she is fairly new so it might be that instead? Leading close to the end of shift, I wanted to ask her number but she left abruptly while I was documenting. I caught her by the elevator with headphones on and talking to someone as she enters the door that just unluckily opened. I did not want to bother the phone convo so I just said see ya in a really friendly manner and she did the same. I think I ended in a good note but did I miss my opportunity considering we don’t have a lot of meet chances?

Like I said, I’m not good at reading flirt atmosphere though I might be doing it subconsciously but I always discredit myself because plenty of humiliation happened in the past due to misreading signals.

I’m 25 and I would assume she is roughly 23-25, I confirmed she is single when one of my coworkers asked her why she does not have a boyfriend despite her pretty looks in an exposing manner and I observed she felt awkward and didn’t answer. It all happened in one night. Any thoughts on what I can do?