Olive Thorin is the wife of Hart Thorin. She a plump woman with grizzly hair.
She is barren and unable to provide an heir to her husband. She resents Susan Delgado for replacing her to provide an heir for him. It is noted that she would gladly help Susan die.
Something must have changed her mind (probably due to her realization that the Big Coffin Hunters killed her husband and not Roland and his mates), though, for when Susan was locked up in the Mayor's house, she helped Sheemie free Susan from the pantry.