This, my friends, is why it is important to have properly graduated levels of difficulty.
There are all kinds of people from all walks of life and ages playing our game. That is one of the awesome things about it.
Some day, this kid is gonna crack Tribulation, but she would not have gotten there without the intervening modes capturing her attention and helping her have fun while learning.
Infantile should not be as hard as Normal should not be as hard as Tribulation.
Stop demanding for difficulty increases across the board just so you can show off how l33t you are.