The daughter of Poseidon

This is the daughter of Poseidon and Amphitrite, she has never been intruduced, not in the Rick Riordan series "percy jackson", or in greek mythology, but Poseidon and Amphitrite is supposed to have to children, and Triton, their son, is presented as their son, not their oldest or youngest son, just their son, meaning the other child is most likely a girl.
no storyline, no ideas for a story, nothing. Just my wanting to practice painting, using chalk digitally. She is mad at her dad for some reason, maybe he broke a promise, or she saw him with another woman than her mom, I don't know. Anyway, the crab is trying to convince her to come home. I think she'll return eventually.
i'm thinking about writing a Percy jackson fanfic with her in it, but I don't know. Anyway, I think I'll try to find a name for her, if I ever want to draw her again, so I won't have to call her the daughter of Poseidon and Amphitrite all the time Any suggestions?