Both Olga Galdamez, 42, and Jaylin Landaverry, 17, had been hospitalized since the July 1 explosion. Galdamez died Sunday at Temple University Hospital, and her daughter on Tuesday.
Students and teachers at Little Flower High School, where Jaylin was about to enter her senior year, held a prayer vigil Wednesday night. Carol Dauerbach, one of her teachers, said Galdamez worked hard to pay the school tuition and Landaverry spent much of her free time helping her.
"It was the ticket to their future, that truck," Dauerbach said. "They worked hard, and they struggled, but they did it joyfully."
Both Galdamez and her daughter were inside the truck, La Parrillada Chapina, when the explosion occurred.
Investigators said one of the two propane tanks on the truck was leaking, enveloping the truck in gas. Propane burns easily and is very dense so that it tends to stay low.