It could be mites or it could be dry skin – it’s hard to tell at this stage. If it’s mites, the best treatment is Revolution (selamectin), a spot-on preparation that you need a vet’s prescription for. It can be used on suspicion of mites, because it’s often difficult to diagnose even with a skin-scraping or a tape-test. An OTC spray against ticks and fleas is probably not effective against mites, but if you say what the name of the spray is, we can help you check.
NEVER use Fipronil (Frontline, Effipro, Sentry and other commercial names). It’s deadly toxic to rabbits. I’m just writing it because we always issue this warning in posts about anti-parasitics in rabbits.
It could also be dry skin, because the flakes are so small and she didn’t seem to mind when you picked out a scab. With fur mites the skin tend to be thickened, there’s often some local hairloss, and the bunny tends to react with pain when you pick at the scabs. The scabs don’t come off easy. If it’s just dry skin you can put on a tiny bit of bag balm or nappy rash cream or other fat cream. If it doesn’t get better with cream but instead gets worse, it’s probably mites. Fur mites are very, very common in rabbits. Revolution is a very effective treatment.