Does she like the attention from me or does she find me attractive? Advice?

I'm dying for a beautiful girl at my work. She's almost the same age as me but out of my league in my opinion. We know each other's names but haven't been introduced yet in person even though she's working there for a while now. She talks with everyone at my work but me. We see each other when she walks from the office down to my work place and on smoke breaks.

We always almost immediately look at each other when one of us enters or walks by and her eyes just light up with a sweet little smile every time our eyes cross. I catch her staring at me all the time and I can't help myself either even if both of us talk to somebody else. And she gave me a nickname based on the color of my eyes. I know this from another female collegue who's texting with her about me and I also saw the messages and they were really sweet. She is having a few days off right now because she's sick and I don't have to tell you how sad I am after not being able to see her sweet face. Her perfume makes me weak in the knees and the fact that she's not there now and talks about me makes me feel like a teenager crazy in love again. My heart is still racing even now as I'm typing this, hours after learning about it. Because I can't stop thinking about her and how much I would love to feel her presence. All this makes my chest tight so much that I can't wait to go to work next Monday because she'll be there and I otherwise fucking hate that place. I'm still too shy to approach after weeks of sweet smiles and glances and all this because at this point it would kill me if she rejected. The only sweet thing at work would turn into an awkward mess and going there day after day seeing her would drive the knife even deeper.