Choice 1: The little mermaid wasn't little at all, she was not polite, she was not loving or caring, and she spent most of her time on her own, singing, wishing that she could be nicer and some day be happy.
Choice 2: The little mermaid wasn't a mermaid from the start, she was a woman, a celebrity at that, she got caught up in theories and was desperate to find out if mermaids were truly real so she met up with a wonderful, friendly woman turned out to be a witch that was only out for her fame on land. She turned the little woman into a little mermaid.
(I hope this helped) If you don't like these I think I can help with another suggestion. I got a little carried away with Choice 2.