Cage rattling can definitely be loud and disruptive. Have you tried attaching a bedsheet or something outside the Xpen to visually block her seeing outside of it? There is a common phenomena where rabbits will chew and pull at cage bars, even if the door is open. It supports the fact that they are really bugged by things “being in their way”. Remember, to her, those bars are arbitrarily separating her from accessing the rest of her territory. It’s like someone randomly deciding to put you in a glass box— you can see your room and your house, but there’s an obstruction there and it can be frustrating, especially if you want to go nap or lounge somewhere else. By putting up a visual barrier, that may stop her from pulling the cage. It works for both of my rabbits.

She is at the age where she is really experiencing those hormones telling her to mark her territory, and essentially do all the “rabbit” things that may be frustrating to us. I know it’s difficult, but remember she is not trying to make you frustrated or stress– she’s just a victim to her hormones at this point, and marking territory and having it smell like her is a way rabbit’s make an area feel more safe for them (like how you may feel more safe in your home vs. a stranger’s home).

Re: trying to be the alpha, I would not worry about that nor try to do actions to sustain that. It is highly likely rabbits do not even incorporate human owners into their social hierarchy — it’s simply very clear that we are larger and stronger than they are. Regardless of how she would view you though, remember it is her hormones driving her behavior at this point.

Agree with Wick 100%. Don’t worry about the hierarchy thing, it doesn’t apply to you because Luna knows you’re not a bunny. And even if she didn’t, you don’t want to get into a poop war with her, it’ll get awkward.