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Chewing the tail and rear end could be due to anal gland impaction or infection. The pressure in the anal sacs can cause discomfort and dogs often scoot or lick when this happens.
Aside from that, now tat she is licking her front legs as well, there are a number of different things which might cause this.
Environmental and food allergies are possibilities. Even without a change in diet, she may have developed a new allergy (this can happen at any age).
She may also have a contact sensitivity - any new detergents, blankets, etc?
Fleas are only one parasite which might cause itching. We can also see sarcoptic mange, for example, causing itching.
Skin infection (pyoderma) can also cause itching. At this point, I recommend having her evaluated by your regular vet. I would start with a physical exam and check her anal glands.
They can do a skin scraping to look for mites, and a cytology to look for bacterial or fungal infections.
If everything is normal, I would start a short course of prednisone to relieve the itching, and try a hypoallergenic diet.