Hello
This could be down to an allergy. We find that raw feeding is very good for this, venison, duck, pheasant anything game. Try to cut out all grain fed animals like cows, sheep and chickens etc.
To keep her feet clean and keep away any possible infection try Leucillin, spray on effected area and dab dry. You can get this off Amazon or from pets at home.
Keeps us all update
Thank you
Camilla
PeakStaff Kennels