Backstory: She was raised by a single mother. Her father was taken away when she was very young and she never fully found out why.
When she was young, very young, she scared her mother very bad. It was shortly after her father had been taken away and so her mom was very worried about something happening to her children. It wasn't Sas' fault though -- she just turned invisible for some reason. It lasted for about an hour, but during that time it is what also prompted her feeling to become a hermit. She felt that things would be fine, if not better, without her. It was a scary feeling and it still sometimes worries her.
Sas has a vision as she is on her hermitage and is visited by Bast who gives her a gift.
From this point, the events are listed on the Menagerie Timeline