I agree that she needs to be on a balanced chicken feed, chick grower or flock raiser, and then layer when she begins to lay eggs. She is probably old enough to start on layer feed now. You may find that trying to feed a balanced diet with whole grains and the other treats is impossible, and she may end up with a vitamin or mineral deficiency. They also can have a tendency to get fat or suffer from fatty liver disease. Glad to hear that her sneezing has stopped. Chicken may sneeze from environmental reasons, but they don’t get colds. Good luck.