Barbie in A Mermaid Tale 2 (2012)
This hatred is used by Alistar a fish sent by Eris who wishes to end with Liah and her mother. Alistar convince Kylie to steal a necklace from Liah, the fish tell her that with the necklace she can dive into the depths of the ocean, assuring her that she’ll be able to win the competition by becoming a mermaid too.
But all this is a plan that has been prepared, because Eris wishes to escape and to steal the throne. Liah realizes about the theft and the intentions of her evil aunt so she must embark on a new challenge just to protect those she loves.