She avoided having her daughter do too much work because she feared her destructive capabilities were too powerful; she worried that their home tools and such wouldn't be able to withstand her havoc.
As her daughter grew older, she increasingly cautioned her not to exert too much strength in front of others and cajoled her by saying she was born under a lucky star and was meant to live a life of luxury. Why would she need to do any rough work?
Indeed, her daughter took these words to heart. As she grew up, she noticed that although her daughter was gluttonous and lazy, the natural strength she'd had since childhood seemed to have disappeared.
Moreover, the girl herself seemed to have completely forgotten about her unusual strength. Whenever asked to do something, she'd complain of pain in her hands, back, and head—everywhere really.
