In the book Anne of Green Gables While being punished for the missing brooch, what does Anne say when Marilla wants her to eat dinner?

These sentences state the answer to your question;

Marilla asks Anne to come down for dinner. She states that she does not want any dinner and says that she couldn't eat because her heart was broken. She told Marilla that she would feel the remorse of conscience someday. Anne said that she forgave Marilla, though. "Remember when the time comes that I forgive you," Anne says. She tells Marilla to never ask her to eat anything. "Especially boiled pork and greens." Anne states. She says that it is "unromantic" when one is in affliction.