text: It may be more than just swollen feet and/or diabetes.  Does she constantly work on her feet?  Is she grossly overweight?  How is her blood glucose control?  Many things come together to determine diabetic foot problems and the sorting out of them is better left to her diabetic Dr and a good podiatrist . Second guessing is dangerous, it could also be her heart or kidneys  or something known as Charcot Foot disease.  Know exactly what the underlying problem is before you self treat.  Living with diabetes is hard enough without foolishly putting yourself in harms way. Good Luck! PS The pros know where to find the shoes too!