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I'm just guessing, it happens with a lot of elderly things, so why not ducks? If she's acting normal, I wouldn't worry. Loosing an elderly pet is never enjoyable, but you have given her a great life and maybe there's some rescue ducks in your area that also need some tlc, when she passes...

I'm sorry to hear that. 13 years old is pretty dang old, her body just might be redirecting resources to more essential things. I'd just make sure she stays warm and happy.