She shook her head when her mum offered to leave. "That's alright, you can stay," she said. Rose was only reorganizing the shelves because she didn't particularly want to think much about how empty the room felt when Bryn was off at work in the greenhouses.
"Right," she responded out of politeness more than anything else. If she thought of the current leadership structure as a government, Rose knew she would continue to be believe that everyone in the 'higher' up positions were tyrannical human-like dementors out to suck the joy and life from the rest of the people there. These thoughts she clearly kept to herself, even though she was warned not to keep things inside.