Final answer:
Elizabeth's feelings for Darcy began to change when she witnessed his acts of kindness and read a letter explaining his actions and feelings.
Step-by-step explanation:
Elizabeth's feelings for Darcy began to change when she witnessed his acts of kindness and character growth. One key moment was when Darcy helped Elizabeth's family during a crisis, showing his generosity and concern. Another important turning point was when Elizabeth read a letter from Darcy explaining his actions and feelings. This letter allowed her to see Darcy in a new light and reconsider her initial judgments.