The Veiled Worlds, book 1: DebrisJo Anderton2011

Tanyana is among the highest ranking in her far-future society – a skilled pionner, able to use a mixture of ritual and innate talent to manipulate the particles that hold all matter together. But an accident brings her life crashing down around her ears. She is cast down amongst the lowest of the low, little more than a garbage collector. But who did this to her, and for what sinister purpose? Her quest to find out will take her to parts of the city she never knew existed, and open the door to a world she could never have imagined.