How can england arrest her when it happened in Paris? It's probably a replica, thse are common in the UK. The problem in the UK is that no one repects guns because they've never beenallowed to use them. Therefore even adults behave like children when a hand gun is present.
From the sound of it, she wasn't even involved. She just happened to be in the car with a complete moron but, according to French law, may now be guilty by association.
Commoner or not, I would be freaking amazed if she saw the inside of a cell over this.