boiling hot water can mean anger boiling is red and bubbly and limited to only being hot and evaporation. I boil when I get mad. Boiling is a high point of heat. I think of witches and a stew that they boil human fingers in.
She was a coward. The woman always ran away from her problems, unable to deal with the evil truth that she was a demon, destined to kill her friends. What would she do? Face her fate, or run away and never come back?