More from this person: “vets say she’s allergic to fleas, put her on all kinds of flea treatments and prescribed cortisone of the itching. Nothing works.”

I’m so sorry to hear of your problems with your sweet puppy.  Nu-stock is an amazing product that only needs to be applied 1 time every 3 days.  This is a smelly product so keep that in mind as I’m sure she is an indoor dog.  It is helpful to prevent her from licking the product off, perhaps a baby t-shirt and socks to cover her feet.  Another old time remedy to add during this time is to put bacon grease on her food.  All dogs are born with mites that cause itching to become worse when their immune system is compromised.  The grease helps to build it back up.  It might not be fleas causing this problem.  Good luck!