She's got a bed up there (I wanted to change the colour of her sheets/pillow but I couldn't figure out a good one that fit the colour scheme of the rest of the bellhome), a little shelf for precious items, some fairy lights (though they're a bit hard to see behind her), and a privacy curtain (kids/teens need their privacy!!)
I imagine she falls from up there a good few times when she's first adjusting, to the point that Hornet considers putting up some sort of railing, but she insists it's fine. Since it's so close by, she ends up using the personal spa very often, which may lead to some scolding from Hornet involving using up all the hot water. Since it is pretty cramped in the bellhome, she and Hornet usually try to give each other space during the day (usually meaning only one of them is inside at a time), though at night they both return here. I can already see a disagreement about one of them not turning off the lights yet while the other is trying to sleep... Of course Lace is always the one to get more heated while Hornet's just mildly annoyed.