stinky feet may be caused by a buildup of dead skin cells and bacteria. I would scrub them every night in the bathtub with soap and warm water and a wash cloth. Also, soaking them in tea water can help too. I saw that on Oprah with dr. Oz. But I would start with scrubbing them every night and if they are extremely sweating during the day, I would consider antipersperant and switching shoes. She should not be wearing shoes without socks and if her shoes smell, I would get rid of them and get her two pairs that she can wear every other day. I would also, suggest making sure she doesn't wear dirty socks. Good luck. I had stinky feet at one time and all is took was one good scrub.