i have a question reguarding my neiece shes 11

http://www.webmd.boots.com/foot-care/smelly-feet

This lists reasons and fixes. Could very well only be the type of shes shes wearing and for how long/often.

get her to use baby powder in her shoes

Encourage her to soak her feet in Epsom salt. You don't have to tell her why, just say they'll feel better. And then try to get her to go without socks, or if she must wear socks (like me), that she changes them in the morning and before bed. That should help....and odor eaters...deff. should think about buying those!

Basically if its normal for an 11 year old feet to smell that bad .

Pour odor eater in her shoes, and watch HER disappear

my niece is two her feet her feet don't smell

What's the question?