If she isn't mounting everything she can, I'd think she needs more interaction with humans. Rabbits hardly ever are mean unless they're afraid or sick.
she mounts sabriel and silas a lot and when they mount her (they are neutered 100%) she squeaks all weird.
i try to interact with her but she seriously does NOT like it at all. i've tried everything to get her friendlier because she used to be SOOOOO sweet. but as soon as her spay was over and she was bonded to sabriel (which she isn't any longer because he broke his leg) but she just won't be nice anymore. trust me, when i say i tried everything, i mean everything from calming medicine to not even touching her and as SOON as you move or something she grunts and runs or nips and ugh.
i don't think she is sick... she hasn't had the crust since (and it was the first time- like the others said, it was probably just hay or something in her nose) and she has been mean for over a year so that would not indicate sickness.
also, trust me, i've known MEAN rabbits who had NO reason to be mean and i have known people who owned mean rabbits who were not mean for no reason.
every rabbit has their own personality and that personality can be mean without a doubt.