Hamster Peeing In Her Wheel?

there really isn't much you can do. with the ovo cages. you'll have to watch out. my hammie does that also and what i did was every time i saw him doing it i carefully picked him up and moved him to a different area. he was just a baby then too like yours. when they are younger than a year, it is easier to train them better habits. he eventually grew out of it. for tough stains, (in the wheel) mix 1/2 vinegar and 1/2 half water and put it in a spray bottle lightly spray and let sit for about five minutes. wipe away with hot, hot, HOT! water. dry well.