Everything you need to understand or teach The Wish Giver by Bill Brittain.
Eleven year old Polly is the central character in the first of the three "Tales ..." At the beginning of her story, she is portrayed as sharp-tongued and insensitive, quick tempered and at times quite nasty. In his narration, Stew Meat makes a point of saying she's not "downright mean," she's just not very sensitive to how her words might be hurtful to other people - in particular, to people...
The Wish Giver: Three Tales of Coven Tree Lesson Plans contain 131 pages of teaching material, including: