The nymph was called Echo. Hera cursed her by taking away her ability to form her own words. She could only repeat the words that others said.
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The nymph Echo, cursed by goddess Hera.
Echo, for one.
Echo's gossip and tales served to distract Hera, Zeus' wife, while he fraternized with other nymphs. As a result, Hera cursed Echo to only ever be able to repeat what others said.
Hera was annoyed by Echo in this way and caused her to only repeat what was said to her.
I would believe it to be Hera, and she did it as she was constatly looking at her husband, Zeus's activities with other women.She cursed the nymph to constantly echo her voice in return for her spoken lies about the location/activities of Zeus.