Personal injury.

If the kid hits someone, not only can she be sued, but so can the city, for negligence. My bets are on the city, with the kid named as co-plaintiff, because the city has deeper pockets than a 10-year-old.

For those who say that lawyers are the problem, I ask what the answer is should someone be truly injured in an accident of this sort. I'm not sure what my insurance would cover of a freak accident involving a kid on a scooter on the sidewalk, yet I would still need treatment. Frankly, if she were to take a blind corner too wide and force me off the sidewalk in front of an oncoming car, I don't think that the driver of the car (or his insurance company) should be forced to pay for my broken bones, and neither should I. That's why vehicles with wheels have different places to be than pedestrians.

Amending the law will let the girl have her business and maintain some protection for the city. Perhaps, if they have pushcart permits, they can put her business under the same umbrella. They can even waive the fee if they want, or give her a "grant" for inventive small business development. Do they have bicycle lanes that she can use safely? Where does she ride her scooter for fun? Still on the sidewalk?

If they just ignore the law in her case, any reckless nuisance can claim the same right to use the sidewalk as a thoroughfare for small wheeled vehicles.