I would say, What you are doing is good. I would not treat the rabbit if you do not think it is infected, and if you are worried, ask a vet to check her out.
I agree with you that if there are fleas in the house (on the dog) then do wash everything, including rabbit stuff… But it seems like a dangerous thing to find the right flea stuff for rabbits — especially if they dont actually have fleas. Again, if I were looking to put any kind of medicine on my bun, I would ask a vet for their opinion first just in case.

I read this:

“Advantage, made by Bayer, is the only topical product that is tried and tested safe for rabbits that is available over the counter. Dr. Brick says that Advantage is “a lot less hassle than the other stuff,” and adds that she considers it a safe product for adult bunnies (she has seen only rare topical reactions from using Advantage, and even then, it was nothing serious). In general, a very small or dwarf rabbit should be treated with half of a pre-filled tube for kittens or small cats; bigger rabbits can be given a full dose for appropriate weight. Because it takes a while for such topical flea treatments to disseminate through a dog or cat’s coat, the HRS recommends that rabbits be kept apart from other animals that have been treated for at least 12 hours. Check with your veterinarian for specifics. Advantage was reformulated and is now labled as Advantage II. This new formulation has treatment for other parasites in addition to fleas. Although still generally safe for rabbits, some rabbits have shown more sensitivity to this new formula. Revolution, available only by prescription, treats fleas and mites safely. “

I got that from this page:

http://www.allearssac.org/fleas.html

Which talks about other treatments.

It says in there if another animal has been treated, to keep the rabbit away for at least 12 hours.

What you are doing is good! Keep it up.

Haha yeah I guess. Not sure how much you can do in the medicine field as a vet though. I know the pain meds I got for my bunny say right on the box that they are for dogs. I dont think they have much for rabbits (even though rabbits are just as much a pet as a dog is — in the sense of how long they live, and how much you love them!). But I do encourage you to ask about treatments for sure, and if they do have something safe for rabbits that isn’t listed on the website I listed!