Anyone else be able to describe an insane customer you see all the time?

We get this lady at my store who just shows up around 9 to 11 twice a week to buy spray paint and always berates us not having someone to man the paint counter before we close. She also just gets mad if it takes more than 2 minutes for whoever has the keys to comeover and she will just walk away from the paint counter to bother some other associates and just constantly miss whoever came to help her and gets mad we don't just drop everything to wait for her to come back, like someone will literally walk over to help her 2-3 times and she just wont be there and then we'll find her yelling at someone else that no one will help her. This happens multiple times a week.