Sera wonders at the woman’s pain—or her ability to remain ignorant of it.
The author's choice to add this line. I think there is a desire to compare Sera's life - a hooker who makes her money enduring sex and the occasional beating, with the poor worman who makes her money enduring laundering and manual labor and dealing with children. They share the same delima - pain in the life - and Sera wonders how that woman handles it or can someone ignore it like she does.
