I agree with Fleurette's assessment and found it honest and spot on. The Kopp sisters led such a sheltered life and had so little contact with people outside of their family that it's no surprise she would find it boring. Their rural address did not afford them opportunities to make friends or participate in community events and their limited financial resources left entertainment out of the question. It's no wonder she considers even a "year of harassment" a far better experience than life as usual.
Fleurette, unlike Constance, has not developed a filter to edit her opinions and speaks her sixteen-year-old mind freely. I think Constance agrees wholeheartedly. She was the one who went after Mr. Kaufman to demand justice, who took poor Lucy's plight, and who dove into the role assisting in the investigation--all activities far more interesting than working in the garden and cooking up wormy cabbages or peas that no one liked. But her response would not have been as honest as Fleurette's. Years of learning to live with secrets and to express herself with caution--especially where Fleurette was concerned, would force her to edit her enthusiasm for the adventure and the future it has opened up to her. She would have put on her sternest demeanor and reminded Fleurette of the dangers they faced in confronting Mr. Kaufman, and the many threats a young girl might face in "interesting" encounters. But, she would be smiling to herself.