I only watched the Disney version a long time ago but don’t remember her losing her voice ❓
That’s a huge part of the Little Mermaid mythology, actually. In the original tale, the sea witch actually cuts out her tongue (Ariel also dies, but Disney took a decidedly more positive route) and in the Disney version Ursula actually steals her voice and then uses it to entrap Eric, the Prince.
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"He was a lot of things to me" "The only conclusion was love"