What reasons did Marilla givw Anne for disapproving of her treatment of Mrs. Lynde? What was Anne's punishment? How did she react to it?

Although Marilla is actually sympathetic to Anne's outburst against Mrs. Rachel, she maintains that Anne cannot lash out at guests. When Anne refuses to apologise to Mrs. Rachel, she is told to stay in her room until she changes her mind. Anne is mortified and sad.