Have you tried any spray on products or shampoo's to stop the itching? At the grooming shop where i go to school we use Eqyss microtek shampoo and it has been shown to help clear up skin problems and stop the itches. maybe it would work on Layla
here is the main website
Welcome to EQyss Grooming Products
the spray
Micro-Tek Spray
the shampoo
Micro-Tek Shampoo
Once a dog starts licking and itching one spot they inflame the skin and just make it worse so they scratch more and more. soothing the skin may help sooth the allergies.