Lina Rather’s 2019 Sisters of The Vast Black is a standalone science fiction novella.
The living starship Our Lady of Impossible Constellations conveys the sisters of the Order of Saint Rita between several extrasolar systems, where they minister to scattered human colonies. Their spiritual ministry often takes a back seat to medical assistance. Forty years ago the colonies cast off the rule of the Earth Central Governance. Freedom from ECG comes bundled with freedom from all the medical resources ECG once provided.
During the revolution, the rebels scourged the Earth, executing some ECG leaders and driving the others into exile, For some time the wounded ECG let the colonies to go their own way. Now the ECG is looking outward again. This will affect the sisters on board Our Lady of Impossible Constellations.