Okay, an update.
I went in today and Miss Mopey was nowhere to be seen. She was replaced by Miss Sunshine! It was like a miracle. This person's poor attitude shadowed her beauty. When she came in today her mood was upbeat. her hair was worn down and shining, she had a bit of make-up on, she was smiling...and she looked like a million bucks!
What happened??? Someone from management talked to her, I know. But they also must have listened to her and supported her. Maybe she had unaddressed issues that came out. I overheard her telling someone that she was getting her birthday off. Perhaps management expressed to her what a valuable employee she was and how much she had to offer.
She was upbeat and friendly with the customers today. She was extremely helpful to me in a very kind and gentle way. She was so positive I could have sworn I heard her humming as she worked! Someone must have listened to her.
I am really glad I brought this up with management. I don't know what the heck they did but teamwork and a positive environment was restored, and although hard the work day was great!