My buns both liked peeing on my bed for quite the while; I think it’s just because it’s super soft and they prefer doing their business on soft surfaces:p. After litter box training it stopped, but that took a minute! And unless she’s trying to get away from you, I’d take the digging and biting as a compliment! My Eve just loooves to dig into my clothes (she loves to dig anything, though) and give me “love bites”. I’ve never been bitten by a frightened or angry bunny before, but I would imagine you can tell which bite she’s giving you if it’s followed by either trying to get away, kicking you, or growling (all indicators it’s probably not a love bite). As for the artwork, no matter how much my buns and I have bonded they’ll just destroy everything they can hop up to. They’ve gotten to more than a few of my drawings, so I’ve started putting all my art stuff in my closet.
I’m glad you took her in! It sounds like she’s just getting adjusted. Things I would recommend are not coaxing her out from under your bed; just leave her be. Ignore her existence. Maybe try doing some art or reading or just messing around on your phone on the floor lying down and just letting her investigate you– it’ll happen eventually! The more she investigates you and you ignore her, the more she’ll trust you.