A flea bath only kills the fleas on her coat, then you rinse off the stuff. So a few days later, the fleas lurking outside or in your carpet hop back on. Definately visit your vet to see if there is an allergy, this is quite common, but also for more recommendations on flea control. I swear by Top Spot by Frontline myself. Hope she's feeling better soon, it's miserable to itch!