Life After Mercury - Life After Mars Series, #3

Now seventeen, Gloria looks forward to celebrating that she remains cancer-free five years after defeating her brain tumor. But her farming community on the Martian Frontier has been under siege for five years, and they've run out of vital imports. Worse, the whole colony is in the path of a deadly dust storm. And the enemy putting them under siege sets a trap that threatens to wipe out Gloria's marriage to Holter, which isn't legally finalized until twenty.
As-is, they struggle to adjust to their roles in marriage, miss their old roles as "bros forever, " and Holter never got over losing her sister to celibacy. When Gloria's life on Mars shatters, her smartglasses also break. Her only hope of at least repairing her AI is a trip to Earth that she'd never return from.