Rich and addicted to stealing

It’s taking me a lot to actually speak about this as I can’t tell anyone in real life. I am very worried. Every time I go shopping with my mum, she steals the most ridiculous thing ever, something as stupid and ridiculous as a bubble gum for example! She always think I don’t know but I see her to it. This woman has a lot of money, we are financially stable that she can buy whatever she wants... what’s with the stealing? I’m confused about how to handle this