Many of Tanith Low's memories of her childhood included her family taking part in the Scarecrow Festival in her village. She and her brother would spend months on end planning the perfect scarecrow, they usually won the annual award because their determination was rather cute.
This is the memory she uses to block out the thoughts of her home burning to the ground, of being cast out of her little world, of being called a witch.
Also, this could be the reason why she calls her lover 'Her Skeleton Scarecrow'
SCARECROW FESTIVALS ARE VERY SCARY FOR PEOPLE THAT ARE SCARED OF SCARECROWS.