Here are some of the reasons she specifically mentions:
* A new challenge: After writing the Hunger Games trilogy, Collins wanted to try something different and explore a new genre. She felt drawn to fantasy and wanted to create a world that would appeal to younger readers.
* Exploration of themes: Collins was interested in exploring themes of courage, family, and facing your fears in a fantasy setting. These themes are prevalent in the Gregor series, as Gregor faces challenges and dangers while also navigating family relationships and discovering his true potential.
* A different protagonist: Collins wanted to write about a protagonist who was younger than Katniss Everdeen and could be relatable to a wider audience. Gregor, a 11-year-old boy who stumbles into an underground world, is a character that many young readers can connect with.
While Collins never explicitly stated a singular reason for writing the Gregor series, it's evident that she was driven by a desire to create a unique and engaging fantasy world for a younger audience. She aimed to explore themes relevant to young readers and provide a character that would resonate with them.