My Tilly will shake her head and scratch more when she has dry skin or is in full shed… but it’s still a good idea if you see extra shaking or scratching to run a flea comb over her a few times to check for fleas.
I am a bit confused on Revolution being used. I know that there is debate on what is safe and what isn’t, but I’ve had 2 different vets tell me that Advantage 2 for small cats (or for kittens depending on size of the bunny) was fine but to stay away from Revolution because they’ve had rabbits come through with problems from the toxicity of the Revolution. We had to give Tilly some flea-stuff because we’ve been staying with family that has an indoor/outdoor kitty that brought in fleas…. it seemed to work wonderfully on her with no ill effects; although we did do the best we could with a flea comb right before and after application to help it along a bit.
Repeated vacuuming helps to eliminate fleas because not all the fleas are hatched at the time of treatment. New fleas hatch when the eggs are disturbed (walking, vacuuuming, etc), but those eggs can sit dormant for weeks or months. The young fleas actually first feed off the droppings of the adult fleas leave on pets and carpet/furniture, as it is basically partially digested blood… it’s along the same concept of cecals for young buns. Make sure to use extra fabric softener in your bedding, too. I’ve found over the years that the fleas really don’t like fabric softener, so it makes them more likely to stay off the bed, and where they can be treated and/or vacuumed up more efficiently.