I promised myself I wasn't going to ask this question, but I don't really care now to be honest.
Basically I just started working and at the same time so did this other girl and a few other people as well.
She is an HB9 (IMO).
Anyways when we first started I was sitting next to a fellow employee who I'd be working with (not the HB9) this girl was probably a 7, but still cute in my opinion. The HB 9 was sitting close to the girl I was talking to. And I un-intentionally excluded HB9 from the conversation and I basically flirted a bit with the HB7 instead. I didn't think this would work to my advantage but it did, the HB9 started trying even harder to get into the conversation. She eventually started asking random questions to me just to start a conversation with me.
As few days pass and I notice the HB9 is throwing me VERY subtle IOI's. Making eye contact occasionally, laughing at the dumbest jokes which weren't that funny. Basically other stuff aswell which I've learnt to notice through the years.
However I also noticed that the IOI's were different. They weren't as obvious as some others girls I've had. They were very subtle and the second we would start getting closer and connecting she would stop as if it was wrong. Sometimes at work she would avoid talking to me, but at other times she would be so into the interaction with me. It was weird.
I admit I was very confused by now.
I had a feeling like she was into me, but she thought she SHOULDN'T be into me, or maybe she felt guilty for being attracted.
Like I said she didn't confirm this but it was a feeling I had.
And a little while later, I find out she has a boyfriend. Now I think I'm starting to understand why she was into me but would give off a very weird vibe when I was around her.
I'm starting to think she likes me but it's complicated because of her boyfriend.

Here's the thing...what should I do??

Should I keep going for this girl?? (knowing she has a boyfriend)
I've been going out alot lately so it's not like this is the only girl who I'll have an opportunity with...they are PLENTY. But still, it's like one of those things you set your eyes on and you can't help wanting..

I was thinking of getting her facebook, and working my way up from there. Turns out...she DOESN'T have a facebook.
EDIT: She SERIOUSLY does NOT have a facebook, I checked and nothing came up and I she even told us at one point at work that she didn't have one..

EDIT2: We work in a restaurant type environment, making it difficult to talk too much because of all the customers we have to serve, we are literally ALWAYS working during the shift..

What do you guys think my options should be? Is it worth it? How should I get her in a subtle way?
I think I won't be able to number close because it'll be to forward.

I would avoid it honestly. She has a bf (I know, some don't mind) and you work with her. The work itself isn't that bad if it isn't your career we are talking about.

If you want to go forward with it then move her out of work and game her there. Talk to your other colegues about going out for drink after work and invite her along. I would go that way.

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Drink me, make me feel real
Wet your beak in the stream
Game we're playing is life
Love is a two way dream

yeah that sounds like a good idea. Might try that if I decide to go for it.
But I'm working casual/part-time and I honestly can't see myself being at this job for more than 3 months because of other commitments such as uni which should start soon.

Just have her as a friend and nothing more and leverage her while you are out at the bar. It will screw everything up or at least has the potential to screw things up.

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"Intelligence is nothing. Action is everything." -Tony Robbins