Nina's mom had a secret. Nina was not sure what it was but she knew her mom was hiding the real reason they had moved to Alola. Why else would her mom be so eager to have Nina leave on a Pokémon journey. It must be that Nina was onto something and her mom needed to get her out of the way. Although she was excited to travel around Alola, she also knew she needed to uncover her mother's secret.
Ooo a mystery... how will Nina figure it out?