<human>: Hey everyone and thanks for your advice.

I'm a 23/M and I have a crush on a female co-worker. We work in the same department, but I close all the time and she works mostly mornings. There have been a couple of occasions in which we had overlapping shifts and we talked, so it's not like we don't know each other at all. 

The first time we talked, I got a good vibe from her that she liked me and we were a little flirty. However, it was the busiest time of the day and our shifts only overlapped for an hour or so. Yesterday, we had an overlap again and she seemed a lot more straight forward. I mentioned to her that I got a morning shift next week (which turned out to be on her day off :() and she said I should try to work mornings more often.

While we were talking, I was called out onto the floor and had to take a customer question. We had 3 hours to talk, so I figured we could just pick up where we were afterwhile since it was the busier part of the day at that moment. However, I was wrong. There were 3 people working in her area and I'm guessing she got sent home early, I'm not really sure, as I didn't see her for the rest of the day.

Now, this wouldn't bother me, but when I checked the posted schedules downstairs, we don't have a single minute of overlapping on the schedules. I really don't want to wait forever to get a chance to ask her out, so I am struggling to come up with ways to get in contact with her. 

So my question for you all is: Would it be creepy or weird for me to add her on Facebook and to use that to ask her out? I've never gone that route in the past as I normally prefer a more personal route. However, it's summer and I don't want to wait for the scheduling Gods to help me out. I mean, I actually have a morning shift, but it's on her day off.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I like a co-worker I've spoken to a few times and want to ask her out. We very rarely work together. Is adding her on Facebook and asking her out there too weird?