If the skin is really dry, then 1 treatment will not be enough. As foryouiwill says, advise the client to make a regular appointment with you, say every week or week and a half until the problem is sorted.
Also while waiting for her next appointment advise the use of Cucumber Heel Therapy, it works wonders!
Also you could add a paraffin wax treatment into your exisiting pedicure, it does need to be left on for a good 10-15 mins though I would say, and even better in heated booties!
I would also try the dry skin removal on dry feet, I find that if the skin is very dry, then it is best not to soak first!
Others might have better ideas than me though! xxxhth's xxx