Fire officials are treating the blaze as an arson investigation, saying that they found several areas were a fire may have been set, the television station reported.
"They did confirm with me and asked me if the possibility of me starting this was even to be considered, and I said 'I don't even have insurance; what would be my motive?;" Cuevas told KSAT.
Fire investigators said they are still trying to find the cause of the fire, KENS reported.
Cuevas said she reopened the store in August after a year.
"Aug. 1 was our first day open," she told KENS. "Oct. 1, 2, I am now empty-handed.
"I am so lost," she told the television station. "I don't even know where to begin."
Cuevas started a GoFundMe page Wednesday.