Start at flying height, not human height
A budgerigar experiences the room as airspace, obstacles, and landing places, so proof it in that order. Close every window and door, including doors to en-suite bathrooms and cupboards she could slip into, and draw curtains or blinds across glass so she does not fly full-speed at a window or a large mirror she reads as open space. Stickers or a light covering on unavoidable glass panels serve the same purpose for a bird still learning the room. Switch off ceiling fans fully and let anyone else in the house know flight time is happening so doors stay shut until she is back in her cage.
Remove what she could land in, on, or behind
Budgies land first and investigate with their beaks, so clear the surfaces she will choose. Move hot drinks, cooking pans, vases, and any open container of water out of the room, since even a deep mug is a drowning risk for a small bird who slips in and cannot climb wet sides. Take out lit candles and anything producing scented smoke or strong fumes, and check houseplants against budgie safety rather than assuming a common plant is harmless; doubtful plants leave the room for the session. Block gaps behind bookcases, radiators, and large furniture with cushions or towels, because retrieving a frightened budgie from behind a wardrobe is an emergency you can design out in advance.
Then do the floor-level pass
With the airspace and surfaces done, walk the room looking down. Coil or cover electrical cables, pick up small objects she could chew or swallow, and remove medicines, cosmetics, and cleaning products from low tables. Other pets leave the room entirely, however trustworthy they usually seem; a cat watching through a closed door is fine, a dog asleep in the corner during a budgie's early flights is not. Check for an open chimney, uncovered vents, or a gap under the door wide enough for a budgie who has fluttered down, and put a towel along it. Finally, set up reasons for her to land where you want: a play stand, a perch near her cage, and a familiar food sprig placed where you can reach her calmly.
The first flights set the pattern
Open the cage door and let her come out at her own pace rather than reaching in to lift her out; a budgie who chooses to leave also learns how to return. Keep the room's people seated and movements slow for early sessions, and keep the cage door open with food and water visible inside so home base stays obvious. If she panics and flutters to the floor, dimming the lights slightly and approaching slowly with a light cloth or a familiar perch works better than a chase with hands. Short, calm early sessions that end with her back in the cage build the routine more reliably than one long, tiring afternoon.
Repeat the sweep every time, in the same order
Rooms drift back to normal between sessions: windows get opened, mugs return, a plant comes back from the kitchen. Treat the checklist as a pre-flight ritual run in the same sequence — glass and doors, fans, surfaces, floor, pets — rather than a one-time project you did when she arrived. If a flight ever ends with her missing a return, breathing hard after a collision, or sitting fluffed and quiet, settle her in the cage and seek avian veterinary advice rather than letting her fly again the next day to see how she seems. Saving the agreed sweep, the safe landing spots, and the house rules for open doors on her profile through KinsLe Family Sharing means a family member giving her evening flight time proof-checks the room exactly the way you do.