I would definatly look into something a litlle more effective than a collar. I use Comfortis as well but I believe the dog has to be over 5lbs to be used...? After you bath her are you using a flea comb to grab the eggs too? That's key in getting rid of fleas. One adult flea can mean 50 eggs and they say 1 flea on your dog equals 30 in your house. So 30 fleas times 50 eggs per flea that's a lot so I can't stress the importance of washing linens and vaccuuming. There nasty bugs and hard to get rid of. Good luck!
__________________ Jess  Mitzy |