What do I need to do to rabbit-proof an area?

Because rabbits are very curious and often chew on things, their exercise area needs to be “bunny-proofed” by moving or concealing anything you don’t want chewed, especially electrical cords. Common steps taken include moving house plants out of reach, covering electrical cords with tubing to prevent chewing, applying anti-chewing substances to woodwork & furniture, and blocking access to spaces under & around furniture, etc. After you think you are done, let your rabbit help you identify areas you have missed. Supervise closely until truly bunny-proofed.

Finally, never attempt to use training alone to keep a rabbit from something that can cause harm or death. Toxic houseplants and electrical wires should be impossible for a rabbit to reach. Counting
on training or "the way she's always behaved" with respect to such things is asking for trouble.