Her soul becomes stable
Ibn Baaz (رحمه الله) said:
“When a woman stays in her house, her soul becomes stable, feels peace at heart, and has self-assurance.
On the contrary, when she goes out of her house, she feels uneasy, irritated, and tense and she may be exposed to evil consequences.”
(Majmoo fataawa Ibn Baaz, 1/422-423)