Dialects, since it has to do with accents
In Anne of Green Gables, Anne promises Diana she'll write Tuesday night. Diana promises to haunt the post office to wait for the promised letter.
Haunt, in this context, is meant "to linger". It means to frequent a place, or be relentlessly present.
Her mother is her final opponent because her mother had so much more power over her and she wanted to break free. Also because she imagined her mother to be her final.
Answer:
Harry breaks off his relationship with Fanny soon after he becomes acquainted with Anne.
