Sounds and looks like a molt. Bunnies molt four times a year; typically alternating between heavy and light molts. This time of year is supposed to be a "light" molt, but you'd never know it by the amount of fur coming off of some bunnies! Sometimes a molt starts in one spot and progresses from there; other times it starts in multiple spots or kind of starts everywhere, lol. How the molt happens varies from bunny to bunny and even from molt to molt for a single bunny, and some can look quite odd. Depending on how a particular molt goes, it's possible to not notice that it's happening (especially if the bunny tends to shed a fair amount year-round), which could explain why this seems "new" to you even though you've had her for a year.
If you ever see true bald patches, especially if the skin is flaky or red, that can be an indication that something other than a molt is going on (fur mites, for example).
Make sure you brush her at least once a day until the molt ends to minimize the amount of hair she ingests while grooming. Bunnies can get hairballs the way cats do, but unlike cats they're physically unable to vomit.
If you see a lot of poops that are strung together by hairs, that's both good and bad - it's good because the hair is coming OUT of the bunny rather than getting stuck inside... but at the same time it should be taken as a warning that you need to brush her more often. If you ever notice a sudden decrease in how much she's eating and/or pooping, then she could have a hairball and needs to see a vet ASAP - a hairball can easily lead to GI stasis, which is usually fatal if not treated properly.
Is this worth a trip to the vet? Or do you think I should just wait for it to grow back out? I've had her for a year in January. She is spayed and is a fully indoor rabbit. None of my other rabbits are shedding like this.
