Structure: Break it into sections. Start with her background, then the inciting incident, journey, challenges, climax, and resolution.
Potential plot points: Maybe a curse on the kingdom that she needs to break. A lost family heirloom. Rival factions. Maybe a twist where she's not who she thought she was.
Character development: Leslita starts as someone uncertain or with a hidden potential and grows into a powerful leader. Relationships with other characters to add depth.