thank you so muchYou need to treat her bedding, carpets, possibly furniture, and backyard.
Essentially everywhere she hangs out.
It sounds like you've got a heavy environmental infestation.
Also treat the cat if you have one. Cats are notorious for being indoor/outdoor and bringing the fleas back inside.
You can get permethrin spray that will help kill the fleas inside. You'll need to retreat in about 10 days as the newly hatching nymphs will need treatment as well.
Sorry about your problems. Infestations can be so frustrating.
Fleas are tricky. Treating the environment is a good start and I'm glad your dog is on flea prevention. However, dogs can have pretty bad allergic reactions to fleas and the worse reactions tend to happen with very small numbers of fleas. If you are visibly seeing lots of fleas, then it would make sense to clean the environment (cracks in floors, floor boards, bedding, etc). However, if you are not seeing fleas but your dog is very itchy, it would be best to make an appointment with your vet. They will be able to determine if your dog is truly suffering from fleas, flea allergies, or potentially from other parasites or infections that cause very itchy skin.
we give her frontlineThe cure to flea allergies is getting rid of the fleas. If you are using over the counter flea treatment that isn't working, you may need to go to a vet to get flea meds that are different, however, most of the frontline type meds are over the counter now. Fleas can build up a resistance though to a certain med which means you need different or stronger stuff.
If it were my dog, I'd treat the environment, check the med I gave her against other stuff like frontline or advantage (which are over the counter in many places) and see how things go.
If things aren't going well in a two weeks, or if she is looking very inflamed, you may need a vet.
If you suspect secondary infection, antibiotics or topical steroids might be prescribed, but the number one solution to flea allergies is getting rid of the fleas on the animal and in the environment.