BOSTON, Nov. 27, 2013—The woman accused of killing 7-year-old Brianna Rosales while driving drunk was ordered held without bail at her arraignment this morning, Suffolk County District Attorney Daniel F. Conley said.

OLIVIA MORA (D.O.B. 7/19/77) was arraigned in Dorchester District Court on charges of motor vehicle homicide while operating under the influence, operating under the influence causing serious bodily injury, and operating a motor vehicle with an expired registration. At the request of Assistant District Attorney Masai King, Judge Jonathan Tynes ordered Mora held without bail.

“We believe the evidence will show this driver was impaired,” Conley said. “If so, this tragedy was 100 percent avoidable. Our hearts break for Brianna’s family and the unimaginable loss they’ve suffered.”

Though Mora is believed to be living in Dorchester currently, she was carrying a California driver’s license and the vehicle she was driving was registered in New Hampshire. She faces at least a year behind bars if convicted of the lead offense.

Boston Police responded to the area of 43 Olney St. in Dorchester at about 2:15 yesterday afternoon for a report of a motor vehicle collision. There they found Rosales suffering from grievous injuries for which she was rushed to Boston Medical Center. She died a short time later. Rosales’ mother, 26 and a resident of Dorchester, was also seriously injured. She went into surgery yesterday, remains hospitalized in stable condition today, and is expected to survive.

Prosecutors say the mother and daughter were walking down Olney Street toward Bowdoin Street after school yesterday when a white sport-utility vehicle turned onto Olney. Traveling at a high rate of speed, the SUV struck a parked car, jumped onto the sidewalk, hit a fire hydrant, and then hit the victims.

Responding Boston Police officers detected the odor of alcohol when speaking to Mora. She allegedly failed a series of field sobriety tests and refused a Breathalyzer test. In a statement after being read her Miranda rights, Mora allegedly stated that her tires were bad and that she lost control of the vehicle.

Mora was represented by the Committee for Public Counsel Services. She will return to court on Jan. 3.

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All defendants are presumed innocent until and unless proven guilty beyond a reasonable doubt.