The parents of a 12-year-old Texas girl were arrested on Tuesday after authorities said they failed to promptly seek medical attention for a life-threatening injury and instead tried treating her with a smoothie.

Miranda Sipps, a Jourdanton Junior High School student from Christine, a small town south of San Antonio, was identified as the 12-year-old who died, Atascosa County Sheriff David Soward said at a press conference on Wednesday.

Sipps, who died Monday, had been seriously injured since last Thursday, but her parents did not seek medical attention for her, authorities said, withholding more information about Sipps injury. Her mother, Denise Balbaneda, 36, and her stepfather, Gerald Gonzales, 40, are facing charges of injury to a child causing serious bodily injury by omission, a first-degree felony.