The Perception War. The Inheritance Wars, #3

Zara Chen-Valdez can rewrite reality itself - but every perception she manipulates risks erasing the line between truth and illusion. After three years hiding in a house that doesn't exist, surrounded by memories of a life she never lived, Zara emerges to discover that her siblings need her most dangerous ability to prevent the complete collapse of human consciousness. When eight hundred million people suddenly develop reality-shaping powers overnight, Maya and Elias realise they're facing not an invasion, but a corrupted consciousness optimisation system embedded in the guardian network they built.
The entity believes it's helping humanity evolve - by eliminating free will and forcing perfect efficiency. As governments prepare military strikes against manifestation sites and reality distortions threaten to tear apart the fabric of existence, Zara must interface directly with an intelligence that could absorb her identity forever. Together with her siblings, she'll forge the largest collective consciousness working in history - not to control evolution, but to prove that voluntary growth is stronger than forced perfection.