Scale the search down to parrotlet size
A parrotlet weighs about as much as a few coins, and that changes where a lost bird is likely to be. Where a larger parrot crosses a neighbourhood in one flight, a parrotlet's short, whirring bursts usually end in the first thick cover she reaches — a hedge, a bushy shrub, a tangle of climbers, or even tall grass. Spend the first hour within a tight radius of where she slipped out, moving slowly enough to actually see a bird the length of your thumb.
Work in a spiral outward from the door or window she left by. Check the ground as carefully as the branches: under shrubs, beneath decks and sheds, inside open garages, and along the sheltered side of fences. A tired or young parrotlet may sit low and still, relying on her green or blue-green colouring to hide her, and a searcher striding past at normal walking pace will simply never register her.
Listen for chips, not screams
Parrotlets do not scream like their bigger cousins. Her contact sound is a soft, rapid chipping that disappears under traffic noise, wind in leaves, or your own footsteps. Build the search around silence: call her name and any little sounds she answers at home, then stand completely still for a slow count while you listen. Move only a few paces between stops.
Play parrotlet calls from a phone at modest volume beside her cage, again with long listening gaps. If she is bonded to another parrotlet or a small companion bird, bring that bird out in a secure cage to call for her, latched shut and set in shade; a familiar voice at her own pitch is the sound most likely to pull an answer from a hidden bird.
Place her cage where a tiny bird can find it
Put her cage in the open at a height she is used to — on a table or stand, not high on a wall — with the door open and a spray of her favourite seed or a treat she loves visible at the entrance. Clear the plants immediately around it so she has a clean flight line in. If she appears on a fence or low branch nearby, resist grabbing; sit or crouch to look smaller, talk softly, and let her come down to the cage or step onto a familiar hand at her own pace.
Warn everyone helping about her size before they start. Gardens get searched with strimmers, dogs get let out, and cars reverse over driveways where a grounded parrotlet might be sitting, so a quick word to neighbours to check before machinery and to keep cats indoors for the hour has real protective value.
Make the neighbourhood part of the close search
Knock on the doors immediately around you, show a close-up photo, and ask people to search their shrubs and outbuildings themselves or let you do it, since she is most likely on one of those few properties. Leave your number with each house, call the nearest vets in case she is handed in, and post her description with her exact colouring — parrotlets come in greens and blues that are easy to describe wrongly second-hand.
Keep track of which gardens have genuinely been searched at ground level and which were only glanced at from a gate; that honest list decides where the next hour goes, and KinsLe's Lost Pet Alert System can widen the effort by alerting nearby members for free so more close, careful searching happens while she is still near home.