so she knew the store policy, decided to ignore it, has known this person has taken food in the past but doesn't call the police and have them trespass, and for some reason thinks she owes the company what? something? to tackle a person taking food?

no sympathy here. who cares if someone takes food? does anyone who work retail honestly get paid enough to care? and if you do care then there's something painfully wrong with you. I worked retail some 20+ years ago and even then I didn't give a flying fuck if someone took something from where ever I was working. I wasn't be paid enough to care I barely made more than minimum wage. the only people who cared were managers and LP cause they were paid enough to care.