Just a guess, but probably because she loved her house and community. She’s been there for like over 50 years, and maybe it’s not true that she felt unsafe. I thought I did read that she felt safe, in fact. Yes, found it:
“When asked if Nancy had ever expressed having any fear of being alone or kidnapped, Blevins said, “No, never.” When asked if she ever spoke about having security concerns, Blevins said, “No, not at all.” (
LINK)
She was active with her circle of friends in a book club, and was in a mahjong group. She picked up her grandson from school and watched him sometimes.
She had health issues but was cognitively sound.
Jmo