Dollar Tree review: Customer service - customer safety

I was shopping at the Dollar Tree Store on Canal Drive, Turlock, CA. Everyone was wearing a mask properly except the associate at the cash register named Leticia. I was in the store for approximately 20 minutes. When I got to the register I respectfully asked her to put her mask over her nose. She refused. I told her she wasn't wearing it properly. She said she was. Our county is in the "red" tier and everyone is supposed to wear a mask in stores. Associates should be complying with store, State & local policy. I will not be returning to the store and will be letting everyone I know that it is not safe to shop there.