Does co-worker [17 F] have a crush on me [17 M] after a year of working together?

She's always been nice, but she's also said some stuff that makes me wonder if she sees me more than just friends.

We were walking together after work, grabbing tacos and I saw a group of people that I knew. I talked to them for a bit beofre they paused, silently asking if she was the girl I was interested in, saying "Who's she?" I said, "Oh, she's just my co-worker." But the person kept looking at me, expecting more, before my co-worker blurted out, "We're fucking." It is completely possible that she just said it because we're friends and I would joke with somebody about that sort of thing, but she later said, "I felt territorial", as I was hugging the girls.

Later, she said that those girls probably have a better shot with me than she does. This is what really tipped me off, and you're probably saying "She obviously likes you". But it seems like some days are like this, and the next day she hints at me dating a mutual friend of ours, or she'll just ignore me for hours at a time as she texts and cleans. Then she'll go out to lunch with this guy, who isn't her boyfriend, basically just to smoke, but she's also said that they're more than just friends.

Is she trying to get me jealous of him, or is she interested in him, and doesn't really see me in that manner? Any help is appreciated. I created this account because I posted too much info on other accounts. Additionally, I'm not interested in her, but I'm confused.

TL;DR; Girl at work, I perceive, is sending me mixed signals. While I'm not interested in her, I would like to know one way or the other.

tl;dr: Mandatory summary/question!