Back to hating the cat/neighbor

Despite being treated by the vet and shaved, I found three fleas on Miss Dummy-Fuzzbutt this evening (in retrospect, perhaps she should have been shave, then treated, but that's really too much kindness to ask from the universe at the moment.)

And of course, the cat was rolling all over the yarn I just bought today for stuff I was actually intending to sell. Needless to say, no sleep for me tonight as I scrub thoroughly, prepare to fumigate the couch, and stand ready to vacuum as soon as The Boy wakes up. (I'll be nice and not wake him up with the vacuum). All available advice leads me to believe that if I just stick the yarn in the freezer for a few hours, it should nip any possible flea problem in the bud. I can't tell you how tempting it is to do the same to the cat...seriously, has anyone looked into cryogenics as a chemical-free flea treatment?