I'm currently stuck in a very strange situation. I've recently met a girl at work and i was never really sure of what to think of her, we work on the same level, we can see eachother but we cannot talk due to having to work constantly. If she got the chance to drop by she'd be very talkative with my co-workers, but barelly with me. I noticed that from the start, everywhere i went she'd be eyeballing me, if she'd drop by, she'd say nothing but she'd be hanging at my desk. After a while i decided to break the ice and call her in to help me fix some issues with work, after my shift i dropped by and thanked her for the help, complimented her eyes and left while smiling at her. she said thank you and kept smiling back while holding eye contact.
2 days later, i come home and see that she added me on facebook even though we never really spoke. I'm assuming she is interested but that she is shy.
the biggest issue is that i have no time to flirt at work because i simply don't have the time, and honestly, my job > everything else.
Should i invest in talking to her on facebook after work, or is facebook in general just a horrible way to communicate? I'm very good with body language, so i feel like it'll cripple me a lot.
Another factor is that she has a boyfriend, but a friend who is dating this girls best friend told him that she is no longer interested in the relationship because they are too different and that he's a legitimate whiny partypooper.
Edit: decided to just go for it since i have nothing to lose tbh. Not sure how the conversation went but guess it was okay. since i knew jackshit about her and remembered me complimenting her, i kinda used that. The conversation went as following.
Me: Hey x, you happen to have a twin sister around?
Her: I'm afraid not, why?

Me: I'm still fascinated by your eyes, having to hold a telescope at 20m might come across as creepy. It's easier if i could put her next to me.
Her: No sadly not, i'm very sorry!

Me: Np, i'll find a way! How does it feel like to supervise 15 new recruits?
Her: Very nice! i actually enjoy doing it a lot! (type's another msg 4 times but stops)
Me: Yeah i can tell. Seems everyone is knocking your door, probably for another reason, but you're a great help.
Her: Thank you
Her: I don't think it's for another reason, there's plenty more good looking girls on the floor. (Didn't expect her to assume this, tried going for a mystery, push/pull route)
Me: Complimentday (something we have here) was actually last week, but i'll make an exception for today. You do have something that stands out, but i can't figure out what exactly.
Her: What do you mean by standing out?
Me: I might be a bit too direct, my apologies!
Her: No, not at all! I really like that, i'm the same way aswell
