a 13 year old should not be getting a fine just for not wearing a mask, if she would be told by police to put on and she would laugh them in the face would be a total different story, she’s a kid after all.
If it's proven to be dangerous to go out without a mask then she should get fined.
After all who will pay the fine? Her parents.
It's their responsibility that their children should wear masks. If someone not wearing a mask is a danger to the public it should make no difference how old they are.
Will a shop not charge a parent for damage that their child did in a shop?