She's nuts. The cops are right. Don't engage. I ran into a lot of people like that when I managed a nonprofit charity thrift shop. One woman called the police on me because I gave her a price of 50 cents on some candlesticks and she said they were supposed to be 25 cents. The police came up when I was waiting on a long, line of customers and asked me to step outside because there had been a complaint. Being contrary at times, I said, "I will not step outside. Can't you see I have a long line of customers? The woman is nuts." Fortunately, they talked with her some more but didn't arrest me.