What hat Stapleton done to his wife? What did she find hardest to bear?

Stapleton tied her up, gagged her and locked her in a locked room full of collected butterflies and moths. Her first inquiry after being released is for Sir Henry. Crying, she claims she would have suffered Stapleton's abuse had he actually loved her, but she now knows she was only his pawn. She also tells them that he probably fled to an old tin mine on an island in the heart of Grimpen Mire. This was the place where he kept the hound locked away.