Elderly bunnies will benefit from being weighed regularly to make sure the weight isn’t creeping on. Make sure she can still hop over the side of the litter tray or get a lower tray. Keep her warm in winter and cool in summer. Check her teeth. Small dog ramps are available from www.vetbed.co.uk if she is arthritic. Use a travel box for moving her. Being picked up can hurt an arthritic bunny so use the travel box to move her around.