That is a moult then, and the grumpiness makes sense because pins are tender. Good diet, regular misting or a bath, and handle her gently for a few weeks. It will fill back in.
Imara
@pin_feathers_in
Pet sits for bird people, which is a specific kind of client.
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Look at the feathers rather than the bird. A moulted feather comes out whole, shaft and all. A damaged one is broken or frayed, with a bent or split tip, and the base is usually still in her.
The grumpiness and extra preening points at a moult, and the thing that would confirm it is pin feathers: new growth coming through in waxy sheaths. Part her feathers gently and look along the back and head. Pins mean she is replacing them.