Coworker at I hooked up last year (great sex) and then I got back with my gf (ex now). Coworker was told that I told a few ppl that we hooked up which was not the case, rumor was started by a 19 yr old drama queen. Needless to say, she wasn't happy and wouldn't talk to me. Then she found out I was back with my gf after that We say hi when we see each other but it's very formal, nothing more to it. I don't know if she's pissed at me for the rumor BS and me getting back with my ex or if she's just avoiding me because she still thinks I'm with my ex.
Long story short, I want to hook up with her again. We both admitted it was great sex so wondering how I can go about testing the waters to see if she's interested again. We're both single and last year we had actually planned on going camping that summer but then things fell apart.
By coworker, I mean I see her maybe 2x per week since our shifts overlap for 2 hours. We don't work with each other, often on different sides of the building, and have a different group of friends we talk to. Plus the drama queen is done now.

Invite her for lunch or happy hour. If she asks why "we haven 't spoke in a while, just wanted to catch up"
So pretty much u need to isolate her and touch base in a non threatening way