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Wiktionary
mother hen

n. 1 (context literally English) A female chicken who bears eggs or chicks. 2 (context idiomatic English) An outspoken and overprotective woman dealing with others' affairs.

WordNet
mother hen
  1. n. a person who cares for the needs of others (especially in an overprotective or interfering way)

  2. a hen with chicks

Usage examples of "mother hen".

She didn't need the help, but Hadi had become as protective of her as a mother hen.

But the chick persisted, and soon was joined by the mother hen, who quickly and neatly consumed all the burrs.