See the room from rabbit height
Every failed proofing job has the same cause: it was done by a person standing up. A rabbit's room is the bottom half-metre of yours, and it contains things you have not looked at in years — the nest of leads behind the television, the dust and lost coins under the sofa, the gap behind the washing machine that leads who-knows-where. So start on your knees and crawl the whole perimeter slowly, then lie flat and check the sightlines under furniture. You are looking for four classes of trouble: things that can electrocute, gaps that can trap or hide her, things she can chew or swallow that would harm her, and exits. Write the list down room by room corner rather than fixing as you go, so nothing gets forgotten behind a bigger job.
Work through the hazards in order
Cables first, always: reroute them off the floor where possible and armour the rest in rigid tubing, including the ones inside furniture gaps she might squeeze into. Gaps second: block behind and beneath appliances and bookcases with panels or boards, because a rabbit who wedges herself behind a hot appliance is a genuine emergency, and a rabbit loose inside a wall void is worse. Chewables third: houseplants leave the floor or leave the room — many common houseplants are toxic to rabbits and she will sample any leaf at her level — and skirting boards, chair legs and door frames along her routes get guards or sacrificial wood. Swallowables last: cables ties, elastic bands, children's small toys, medication and cleaning products all leave the room permanently, not onto a low shelf she can reach by standing against it.
Set the room up so roaming works day to day
Proofing is only half the room; the other half is hers. Anchor the space with a base she recognises — her litter tray with hay beside it in the corner she gravitates to, water in a heavy bowl she cannot tip, a hidey house, and something to dig and shred. Rabbits are creatures of route and habit, and a room with her landmarks in it gets used calmly, while a bare room gets explored destructively out of boredom. Flooring matters too: long runs of laminate or tile are stressful for an animal with furry feet and no grip, so a washable rug along her main route between base and favourite spots saves both her confidence and your skirting boards from scrabbling damage.
The first sessions tell you what you missed
However thorough the pass, assume one hazard survived it and let supervised sessions find it. Watch where she goes in the first ten minutes — she will inspect exactly the corners your eyes slid over — and watch what she returns to, because repeated interest in one spot means something there smells chewable to her. Fix findings the same day, before the room graduates to unsupervised time. KinsLe's Family Sharing keeps the finished system intact across the household: the proofed room's rules — plants stay out, cables stay armoured, the door stays shut, nothing small and swallowable comes in — sit on her shared profile, so the room you proofed is the room everyone else maintains.