Where is the mermaid sim from the trailer?

https://pmcvariety.files.wordpress.com/2019/06/sims-4-islanf.png?w=1000&h=563&crop=1

I swear i thought i had seen her in my game at some point, but looking from the manage households tab she's nowhere. Am I goign crazy and she's not in the game? Why the other sims from the trailer are in Sulani, but not her?!