Woman sneaking glances at me?

I'm your typically 20year old working at this store & whenever I see this woman she's always doing quick glances like looking around. She's tall like me, mascara, long brunette. She seems "fancy", she even drove in a new Honda Sonata Hybrid, soon as she pulled up I could've swore she did a quick glance at me. Maybe I'm imagining things. But whenever she walks in the grocery store it seems like she does quick glances to everyone else also. Also one time she was walking I looked at her & she did a quick smile. A few wks later she came in with some sunglasses, once again being "fancy" I quickly decided to mess with her. I said "you can't wear those" with a smile. She walked a little and smiled at me like "what? Well i'm gonna wear them anyway!" smiling. Some time passed by, I turned around messing with my co worker then she walks pass me looking at me saying "i'm still wearing themm". I look at her trying to think what to say. She starts to walk toward me "why? Why can't I wear them?" tilting her sunglasses down. Then I say "i'm just joking with you" smiling waving my hand, she laughs at the same time with me. Turns around & says "cyaa"

Another time I'm walking & just when I look over to her she says "Hey hru?", some time passes & I'm walking a different way & she does the same smile.

Added (1). A wk later she came in doing quick glances with a little smirk. She did this like twice. My friend caught her and she went around the store real quick. She went to the aisle beside me then changed her mind & came thru my line. I played it cool & she just starts convo & she had to go. Friendly or she's trying to break the waters?

She is trying to break the waters. She is hinting to you that she wants you to ask her out on a date. And just simply ask her if she would like to go to get coffee or lunch or dinner with you. If she keeps doing the glances after you ask her out on a date, then she wants you to ask her out on another.