Can I sue the store manager who accused my wife a shoplifter?

MY wife was in a shopping center. She had a buggy and her purse was in the the baby sitting area. she had milk, eggs, chocolate milk and eggnog. She grabbed some all natural sugar and put it on top or part of it was in her open purse. she was still in the aisle where she got the sugar in middle of the store when the manager walked up behind her and asked if she was not going to pay for the sugar. The manager asked her to leave and never come back in the store. What case do I have here? she continuing to shop when the manager walked up. The manager said she was reported by someone. Should I complain to the company headquarter for this? She was never near the store exits or the cash register. She was in the middle of the store and wanted to finish shopping.