I had a quail that just always looked rumpled and grumpy, he absolutely hated being handled and took forever to fill back in after moulting. I supplemented his feed with a little chia seed and mealworms for Omega acid boost, fat, and protein. I don't know if it's perhaps just genetically frail feathering like you see when two Frizzled are mated, some of the offspring have brittle feathers, occasional bare patches, and heart issues. If you do supplement make sure to offer grit alongside. Hopefully it will resolve after the first juvenile moult, but that just may be a part of her.