Why do she stare but not say anything?

Me 30m her 30 something female. Both work at the same spot. I'm a cook she's a server. She has 3 kids, husband, we don't talk, text, or call unless work related. We don't speak outside of saying goodmorning. I don't pay attention to her much as she has tons guys and girls to talk to, plus she be on her phone a lot on snap chat, tiktok or Facebook. ( she shows me 🙄)

So after she talk with some people or she's off to her self she would be on her phone. Me minding my own business. I look up and boom💥 she's staring at me. Some times hold her gaze be 3 seconds other times just quick glance and she look somewhere else. This happen at least once or twice every shift we work. I try to be polite about it and say " oh I know your hungry, what do want?" Or " with them bubbly eyes you get 1 wish, make it count." She be like "well 😏 since your offering." She dont tell me what she want cause she don't know. Our conversation be short. Really short. But I can't help but to wonder for a full year she been doing this. Why? What could be going through her head? Why me out of everybody? What makes a person do this?

Why do she stare but not say anything?
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