The sheriff says the robbers then poured a flammable liquid on the victim and lit it. But Beth Dow says her mother-in-law is a survivor.
"She remembered she had a gallon of water she filled her breathing machine with. With those broken hands, she took that top off the gallon of water and poured it on her head to put out the flames," Dow said.
The victim also managed to crawl to another room to get her cellphone and call 911.
The sheriff department arrested Justin Grady, Cortavious Heard, and Shanquavious Cameron.
Dow will likely spend several weeks in the hospital.