People at work getting very annoyed?

Hi, I'm a cleaner at work and have to clean around the staff who work there which I don't mind because they tend to move while I hover which is fine. There's this women who I hate tho, her attitude stinks, every time I hover she's just sat there watching me, I never see her actually working which pisses me off. she doesn't speak to me hardly and she scowls at me every time she HAS to talk to me. She really annoys me I feel like slapping her sometimes lol. It's not just me either shes like that with other people too I've heard. I just ignore lol.

Thanks