Sounds like new feathers coming in. The feathers form inside sheaths, and once ready the sheaths flake off and the feathers emerge. While they are still inside the sheaths they are called pin feathers. Could be part of a juvenile molt, and there may be more on other parts of her body also. Sometimes it's very gradual and not very noticeable, they are more visible on the head and neck. So probably perfectly normal. Here's a couple of pictures of pin feathers and sheaths.