Shoplifter denies stealing

Rina, a schoolgirl, shoplifted at your store, w/ you then escorting her to the store employee room. Rina denies shoplifting + threatens to accuses you of kidnapping her, that she will scream as loud as possible so all the customers/staff at your store would arrest you for violating an innocent girl. Rina laughs at the idea that a rich girl like her would shoplift a shitty nail polish bottle from your pathetic store. She would never apply such China knock-off product on her beautiful body. Do you let Rina go so she can attend her upcoming Yoga class...or do you feel like she needs to understand shoplifting is a serious crime?