Oh, I’m glad, then the risk of true diarrhea is a lot lower. As long as she is still producing normal round poops as well as sticky poop, this isn’t an emergency. It’s a condition called intermittent soft cecotropes, and it’s very common in rabbits.
You can cut off the poopy fur with scissors, but take care (obviously) so you don’t cut into the skin. I sometimes cut poopy fur from my Bam’s behind. You can also give a butt bath in a couple of inches of lukewarm water. Dry the bunny thoroughly after so she doesn’t run around with a wet behind and get cold. You can use a microfiber towel or even a hairdryer on the lowest setting.
There are many reasons why an adult bun can get poopy butt, but the most common cause is dietary. Sticky poop can result if the bun doesn’t eat as much hay as it should (and because we free-feed hay to our buns it’s difficult to keep track of exactly how much they eat), if the bun has had a new type of veg or more veg than normal, or, especially this time of year, fresh grass from the outside.
So the first thing you do (after dealing with the actual poopy fur) is to look over the diet. You can reduce amount of pellets and give more hay, that’s often the quickest way to “mend” an upset tummy. There are no health risks with cutting back an adult bun’s pellets by a third or even 50%.
Here is a good article about intermittent soft cecotropes:
https//rabbit.org/intermittent-soft-cecotropes-in-rabbits/