Mystery Mermaid???

You are Zac's twin sister and Mimmi's younger sister. You were lost to the pod after Zac was given up and Mimmi was sent to the Northern pod. You grew up forging for yourself and exploring the ocean. You don't trust easily since you've never really been around people or other mermaids.

Zac and Mimmi started getting visions but they weren't from each other. One day a girl washes up on the beach but not just any ordinary girl a mermaid. What mysteries does this girl bring and how much will it complicate things with the mermaids.

This story is during season 4.