Fleas are tough!! Head and Shoulders does not work. Water alone does not work. The spot-on veterinary flea products (advantage and frontline) are best. However, they can be hard on the liver and if your cat has just survived a toxicity then the vet may wish to give her some recovery time.
You need to treat the house, and if she goes outside, the yard. Fleas mostly live *off* the animal and there will be zillions of eggs in the carpet. Until you address this problem, she will become reinfested. Talk to your vet or an exterminator about the best methods for this. Personally, I recommend having a professional exterminator, because flea bombs are expensive and need multiple applications, and an exterminator costs you one time and guarantees the work for a year.
Jean Hofve, DVM
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