She moved around mostly in the dark. That was her preference.
Not that she couldn’t go in the daylight. She just found it an intrusion.
She’d always been the same, even as a child.
Whilst others were afraid of the dark, she found strength in it.
The ability to move around stealthily, without being noticed.
Not that anyone at home noticed her anyway. So that is why she stays in the shadows. She stays in that dark.