Fleas in a multi-cat house

Hi All! I'm looking for way to treat a cat that can't be medicated with conventional topical treatments and preventions. We have 10 housecats and have recently acquired fleas. Grrrr! 9/10 have received topical flea treatment and the house has had it's once over cleaning. However, one of our cats is a tiny thing... 5 lbs. full grown... and also has neurological issues and occasional seizures. She has also had poor reactions to flea treatments in the past so I don't want to put it on her. My assumption is that as the fleas realize she's she only "viable" host soon that she'll be totally overwhelmed w/ bugs. Is there anything I can do other than regular grooming/combing/bathing to help her fight the fleas?