Hi you didnt mention since how long she has been suffering from this problem .Anyway it seems to be some allergic reaction
either due to drugs she has been taking or may be due to her pet cats she need to have a review of her medicines from her physician in case of drug allergy
she has to discontinue the culprit drug and in the meantime she could apply some medium potency steroids like fluticasone
and she could also have a short course of oral steroids like prednisolone
for 10 days or 2 wks but do consult with your doctor before starting any medication.