Your kitten is nearly an adult
By one year old, your kitten will be an adult cat. She may still act like a mischievous kitten, but her needs will have changed. When she's fully grown, she'll need a grown-up food to provide her with the nutrients, vitamins and minerals she needs.
Adult cats don't use as much energy as kittens, so continuing to feed a kitten food could cause her to become overweight. Your vet will be happy to advise you on your pet's diet and recommend a suitable adult food. It’s a good idea to transition her slowly from the kitten food to her new adult food, introducing it gradually over a 5-7 day period, to get her used to the new taste and consistency.
If you don’t intend to breed from your cat you should consider having her neutered. Neutering has many benefits for your kitten’s health; speak to your vet about the advantages it will have for her. However, cats that have been neutered are at a higher risk to put on weight. When your cat is neutered her metabolism tends to slow down, which means she doesn’t need as many calories. There are special diets available that can help prevent her gaining weight after neutering, such as Hills™ Science Plan™ NeuteredCat. At 14 months of age your vet will also recommend a booster vaccination to make sure your cat's immunity from disease is maintained. This is also a good time to make sure she's up to date and protected from parasites with flea treatment and worming preparations.