Make her sound like the character you're supposed to be portrayed. Victoria is the main antagonist of the series. This makes her the main adversary of Josh. She's trying to do everything in her power to make Josh lose the tournament that they're both in. However, she's only doing this because her dad makes her. This is later revealed in the series, along with the reason he's doing it. In reality, she's indifferent about octolings. And by the end of this series, she takes a liking to the unfamiliar species and Josh as well. But for now, all of these audition lines are before the whole redemption arc. She can come off as bossy, deceptive, short-tempered, and even somewhat mean or rude to pretty much everybody but her dad and her best friend, Sophia. 

Voice reference: https://youtu.be/ojnE8rJytrU