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Millie the Miser was presumably a female anthropomorphic duck.
Millie was a famously miserly multimillionaire, of whom Scrooge McDuck knew. She died at some point before 1982, and her similarly stingy niece Tillie Tightwad inherited her millions, which she kept in an underground money bin beneath her shack.
Behind the scenes
Millie was mentioned in the 1982 story Matchmaker.