Neighbors say Latasha Jones Isabell was smoking a cigarette outside, noticed the fire and raced to a nearby home to summon help.
The cause remains under investigation.
On Sunday, there was more reason to grieve: Carter-Camp's 7-year-old son, Bryan Timothy Camp, was removed from life support between 8:30 a.m. and 9 a.m. Sunday, said Charleston Police Sgt. Bobby Eggleton.
With two years separating the sisters, Bausley said the pair had been virtually inseparable since they were children. Lisa, as Carter-Camp was known, always was teased about having her younger sister with her.
"Lisa's just always felt obligated to look out for Tasha," Bausley told The Associated Press.
But Carter-Camp had plans to start a new chapter in her life. Carter-Camp told neighbors she planned to get married in June and move to Pittsburgh.
Eggleton said police had talked to Latasha Isabell once and plan to do so again about what happened. Bausley said she has yet to talk about it with the family.
"Tasha is devastated, I can't even describe it," Bausley said. "I haven't heard her say a word since this happened. She's just been staring off into space.
"I haven't heard her voice."
Bausley said Carter-Camp was recently divorced. Her ex-husband is a city transportation driver who spent the weekend watching over his son. "He's devastated like everybody else," Bausley said.