It sounds like the stress that made her pick her feathers was from living with the flock. Seems like it could only be a good thing to keep her as a house duck. Good for her to relax, good for you to get as much special time with her as possible.
Be comforted; the best we can ever do for any animal is to make sure it's happy and it's needs are met. No matter how long or short a time that may be.
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According to my vet she was stressed even when i did have her inside becuase it shows in her feathers and she said she has been stressed for quite awhile now and she has only been outside a little over a week.
She can have what ever makes her happy and she can choose between being outside or inside.