Co-worker Problem, any advised will help !?

I had a co-worker whom i know, the relationship between us is mutual, i don't hate her nor like her. We work the same company with the same position-coordinate the line ( pick/packing product )

Our company required we take a day off in a week, on that day off, we can come to work at different job if we want to.

She came to work at my line on that day as a packer. The company's policy was no cell-phone, candy or gum on the line. As a line coordinator i feel like she dis-respected me when she just keep stop working and .. check her phone or text, even went off the line and ... talk to others person on other lines. I in- form her once. she stopped an do it again soon when i left for my break. others packers on the line was complained to me about her, i didnt want to embarrass her infront of others by being mean so i took it to supervisor.

My question is ... did i handle it the right way, did i be so hard on her because there's one lady, same position as mine, her opinion was ... i shouldn't .. done that, like im kind of a person who ... go around and ... sneak on somebody. that makes me feel ... upset.

Thanks !