
Maybe taking a more natural gentle approach would help, try using something like neem shampoo from www.neemgenie.co.uk which is a brilliant shampoo for dogs, helps the skin to heal and is a mite and flea preventative. You might also think about adding garlic to her food and thinking about her diet, is she on pet food or do you feed a natural, raw diet?
If you don't want to change diet then the neem shampoo and also colloidal silver on the skin will help, you can google colloidal silver for suppliers, but it is an amazing product.
I would definitley steer away from all the chemical treatments and yearly boosters/vaccinations.