The Siren's Deadly Curse

Ondina is a mermaid, well not just any mermaid. She is a Extraterrestrial, which means she was born a mermaid rather than a human turn mermaid. She has always had this desire to go to the human world. Her parents keep telling her not to due to the risks that she will put on herself. One risk is that anytime water touches her she will turn back, but little does she know once she gets her legs she turns into a siren. That is the curse of the Extraterrestrials, anytime one goes up they get cursed. She is a 16 year old mermaid that wants a different life. Will she learn her lesson down under, or will she have to learn her lesson the hard way and become a victim of the curse?