^the man knows his stuff, though that treatment is for when you have an invasion of fleas
Depending on how bad it is, you can give your kitty frontline (check with the vet for sure that it's compatible with the other shit you gave him already!), and let her walk through the entire house, so the fleas can jump on her (they will, they need her). Realize this can take up to a week or two as you have eggs hatching and stuff. Vaccuuming will help shorten this period.
A flea bomb would take care of the fleas in the house, and frontline would take care of the fleas on your cat. If your kitty is covered in fleas, the oral treatment he suggested can help make eggs stay eggs instead of turning into fleas, eliminating the waiting time to get rid of the problem as well. An adult flea lives about 48 hours, so that would rid you of your problem in about two days instead of 10 days. Up to you to see how bad the situation is and how annoyed you are (all these things don't come cheap..)
What I'm wondering though, is ....does your cat go out of the house? And, if so, are there many strays around? Coz, that could be why the other product you're using 'isn't working'. If she keeps getting fleas from others, you can treat her till the cows come home, but it aint going to work. You'll have to eliminate the flea problem in the stray cat colony, by using the oral medication.
Good luck
