When did Nelly see hareton again and how changed was he?

Nelly went to visit Wuthering Heights to see how Hindley and Hareton were doing. She saw little Hareton outside, but he didn't recognize her as his former nurse, so he threw a rock at her and cursed. She found that his father had taught him how to curse, and that Hareton liked Heathcliff because he defended Hareton from Hindley's curses, and allowed Hareton to do what he liked. Nelly was going to go in when she saw Heathcliff there; frightened, she ran back home.