Answer:
Breakfast, dinner, and supper were very silent meals—for Anne still remained obdurate
Explanation:
The sentence that suggests that Matthew and Marilla missed Anne's chatter when she stayed in her room in the sentence above because meal times were described as being very silent because Anne was still obdurate.
From the excerpt, it is clear that Anne had done something wrong and she was being asked to apologise to Mrs Lynde but she refused and because of that she was made to stay in her room.