She has been scanned for free by a vet to see if she is microchipped, but unfortunately she is not microchipped.
The finder has put details on Pets Located
Animal Rescue charities like The Scratching Post recommend that it's vital for cats to be neutered and microchipped. Adult cats enjoy catflap access to a back garden - and cats need a catflap access to get back inside their home. They advise locking the catflap at night so that cats are safe inside at night as it reduces the risk of them getting lost or injured. Remember not to let them out the front door as there is the risk of being injured by a car.