Most parents are happy to have a child marked by the gods, Sarah's parents would have been ecstatic if their little girl had a birthmark shaped like a butterfly, they would have been contend with her hand being marked with the three daggers, but the eight pointed star on the baby's head less welcome.
But at least little Sarah was healthy, even if she was more prone to act randomly than other children. The troubles started when she started to display her God given magic, everything from healing to summoning magical warhammers. The hired exorcist didn't do much good, neither for his sanity or for young Sarah, the only thing he achieved was her birthmark Turing black.
Being sold to the Artifact retrieval agency was quite a surprise to her, but not that unexpended for the young anarchist, maybe sacrificing the chicken she should fetch for the festive dinner to chaos before handing it to her mother was a mistake or maybe it was her success in recruiting for her cult, or maybe the times where just that bad. She was glad (and a tiny bit insulted) to not be sold to a brothel in the city (but maybe that's because of Azathoth on her forhead)