Animated 80s movie shown on Disney Channel, girl steps on coral, she was saved by a whale?

This one was also shown in the 80s on the Disney Channel, an animated movie with a young girl with light colored hair who at one point in the film is under water and accidentally steps on a coral, and she grows faint, but then I think she’s saved by a whale. If I recall the whale is a main part of the movie, but that’s about all I can muster from it. Any ideas please throw them out here! Thanks.

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