Rabbits problems :/

Alex
Bunny isn't cleaning her butt/eating cecotrophes. It's to the point where when I bathe her it's dirty literally 5 minutes later, I don't know what to do. She isn't overweight, she eats a hay only diet, she isn't sick. My other rabbit who shares a cage with her and has for 3 years, cleans herself. It just started a couple months ago