Bad idea. Even if the child doesn't know whats going on, it isnt a good place to go. First its one child, next everyone wants to stunt their kids...
so you'd rather kill someone then let them life their life, the person doesn't know if they're 10 years old or 40 years old so it doesnt matter, the person doesnt understand when a person makes fun of them, their brain cant process it, her life will be miserable idther way, you may as well make the best of it by being able to do things for her easier and quicker