The customer is always right, right? Warning: NSFW

Someone got the plate on her car.....

pms-24-7-license-plate.jpg
 
Are you allowed to detain someone in a situation like this? I don't run a business so never had to consider this. Most of the damage was after she was locked in; I wonder how that plays out in terms of damages, insurance claims, etc.. I'm ignorant on issues like this so curious about it.