I am pretty sure that themes on which William Folkner focuses and takes as a basis of his masterpieces are definitely : love, honor, compassion, and sacrifice. First of all, there is a prompt in question that is put in quotation marks. Love and compassion are the points which always were in need for people's relationships and honor with sacrifice, as told by Folkner in many of his works, are connected to more global sphere of demand - they are universal issues.
An author can try to give the thoughts of the character or maybe a flashback from the past that reader doesn’t know about yet.
Because she knew him well enough to know his behavior when there was a attraction