The Blossoming of the Big Tree

An autistic grandma struggles to fit in because her village has a very tight sense of community. To avoid being seen as anti-social, since its easier for her to interact with others over work, she accepts to chair the committee for national defense. The job is simple, requiring her to coordinate responses to the climate crisis, until a colonizing superpower invades to capture the technology that makes her country a solarpunk utopia. Her nation is a loose union of hundreds of thousands of self-sufficient villages, and they have no army, no weapons, so how will she coordinate their defense? Will the invasion lead to a disintegration of their utopia, or will they find a way to defeat the colonizer?