What condition does Claire's father impose for her cure?

Vanessa must drink an amnesia potion and leave Claire permanently.

Why does Claire reappear after twenty years?

She intervenes when Vanessa's boyfriend Bryan betrays and hurts her.

The Lost Mermaid Princess

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The Lost Mermaid Princess — A dying mother accepts a cure requiring her daughter's erased memory and departure, then resurfaces two decades later to protect her.

Claire's father cures her terminal illness only if Vanessa drinks an amnesia potion and vanishes. Twenty years later, boyfriend Bryan attacks Vanessa, and Claire emerges from obscurity to defend her.

Quick answers

What condition does Claire's father impose for her cure?: Vanessa must drink an amnesia potion and leave Claire permanently.
Why does Claire reappear after twenty years?: She intervenes when Vanessa's boyfriend Bryan betrays and hurts her.