What is Nelly’s role in the dispute? How do you think Brontë intended the reader to feel about her behavior?

The next time Heathcliff visited Thrushcross Grange, Nelly witnessed him kiss Isabella in the courtyard. Nelly informed Catherine what she had seen. When Heathcliff came in, the two had an argument. Heathcliff said he had a right to do as he pleased, since Catherine was married to someone else, "You are welcome to torture me to death for your amusement, only, allow me to amuse myself a little in the same style." Nelly certainly seems a character who has a sense of what is going on. She sees the amoral behavior of many of the characters and seems to enjoy holding them to task.