Fifteen eight people were killed in the attack, making it the deadliest mass shooting in modern American history. Gervai's death could potentially be the 59th death, depending on the results of an autopsy.
Gervais, who suffered from spinal cord injuries and had recovered at a care facility in Redlands, California, died Friday, coroners said in a statement Monday.
An autopsy will be performed to determine the cause and manner of death, the statement says.
Gervais went to the festival with two other friends, one of whom was killed during the shooting, Sarvela told KPTV.
The night before the festival, Sarvela says that Gervais told her she was ready to sell her business, retire and enjoy her life, KPTV reported. "Don't get it, she won't get that chance," Sarvela said.
She said Gervais had been in pain despite being paralyzed, the branch reported. "There was still scrap in her because he was using exploding bullets," Sarvela explained.
Her sister said she was comforted by the idea that Gervais can go with her deceased husband, who died in 2000.
"I also know that she missed her husband very much, and that's what gives me hope – that she is with him right now," Sarvela said.
This article has been updated to clarify that Gervais cause of death is not yet known.