A. This is probably due to a severe allergy, although it could also be fleas or mites.
First of all, in order to rule out skin parasites, you will need to treat her with a high quality flea treatment (e.g. Advocate or advantage), then get her to the vet to perform a skin scrape - this might revile an infection or a mite infestation.
If all of those came back negative, the next step is to treat the allergy symptomatically and try discovering the cause of the allergy.
Some medications can be given by the vet in order to stop the chewing and repair the skin lesions (steroids and antibiotics). Simultaneously you should start her on a prescription hypoallergenic diet for at least 2 months.
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