Her swimming about causes the shark to ram the ship until the diamond onboard is dropped into the water. She tries to lose Titanus in the current (to no avail) instead asking Garroth's ship,- who she mistakes for a whale,- to help her. When she left thinking the coast was clear, she's attacked again. Once she passed the barrier however, she was attacked by Titanus and forced to swim away and hide in a cave far from the kingdom. Luckily Katelyn shows up and allows her through, but only to where she can see- no wandering. Using a sea crystal that Princess Katelyn 'dropped', Aphmau tries to pass the barrier. Though Teony at first wants her to stop, she starts encouraging her and rooting for her. She first appears in ' The Heart of The Sea', wherein she is again trying to pass the barrier. She tried at least once to pass the barrier, getting a star-shaped scar on her arm as consequence. She was eventually adopted into the royal family by King Eric, making her a princess of the kingdom.
When she was just a child her biological parents died, and she was comforted by her best friends.
Before the series, Aphmau grew up alongside Katelyn and Teony.