A 36-year-old woman pleaded not guilty today to charges that she was drunk when she drove her car onto a sidewalk in Dorchester Tuesday afternoon, killing a 7-year-old girl and seriously injuring the girl’s mother.

Olivia Mora of Dorchester was arraigned on charges that included motor vehicle homicide while operating under the influence and operating under the influence causing serious bodily injury. The crash killed Brianna Rosales and injured her mother, 26-year-old Glendalee Alvarado.

Mora was ordered held without bail. Her next court appearance is slated for Jan. 3.

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A prosecutor said in Dorchester District Court that police detected the odor of alcohol on Mora’s breath after the crash and Mora failed three field sobriety tests before refusing a chemical breath test. Police sought a warrant to take a blood test; the analysis isn’t complete yet.

Assistant Suffolk District Attorney Masai King said Mora gave several different addresses when she was questioned after the accident.

Mora allegedly told police her car had “terrible tires” and she had lost traction — and control — of her car.

According to a police report filed in court, “She continuously denied having had anything alcoholic to drink, stating that her last drink was at approximately 10 p.m. the previous night.”

Mora, a 2002 graduate of Babson College, is the mother of a 3-year-old. She has one felony conviction on her record, her defense attorney said.

The attorney argued that if Mora were held without bail, it would cause “extensive” hardship to her family and that Mora had roots in the area that would keep her from fleeing.

“She has extensive ties to the community,” said attorney Gerasimos Antzoulatos.

Alverado was expected to survive her injuries but as of late Tuesday night she was still in surgery, the Suffolk district attorney’s office said.

The crash happened on Olney Street at about 2:15 p.m. The girl and her mother were walking from the direction of the Holland Elementary School.

Mora was allegedly driving at a high speed. “She was flying,” Boston Police Superintendent Daniel Linskey said Tuesday at the scene.

Mora has a lengthy record of traffic violations in Massachusetts, according to the state Department of Transportation.

Mora, who has never held a Massachusetts license, has been cited multiple times for traffic violations such as speeding, improper equipment, seatbelt violation, and improper passing, the department said. She has also had her right to operate suspended a number of times.

On Olney Street this afternoon, a makeshift memorial for Rosales of more than a dozen stuffed animals, flowers, candles, and a pink Mini-Mouse Christmas stocking stood grew at the scene of the crash.

The fence that Mora struck remained down in a crumpled heap, and the hydrant that she hit was still overturned on the sidewalk.

Ashley Goodrich, 22, who lives on the street, said she agreed with the decision to hold Mora without bail.

“I think it’s more than fair,” she said. “You killed a little girl, and you’re drunk.”

Goodrich said she rushed outside when she heard the crash and saw Alvarado stuck against her fence.

She also said Mora was using her cellphone while police were trying to speak with her. Goodrich, who has a daughter, said Rosales’s death is especially tragic because it came just before the holiday.

“Thanksgiving, it’s something [where] you’re supposed to be with your family, giving thanks for them,” Goodrich said. “To have that happen, it’s sad.”

She added that she was shocked by what she saw in the immediate aftermath of the crash.

“It was crazy,” Goodrich said. “You don’t usually see that next to your house. It was scary. I started crying, because I have my daughter.”

Another neighbor, Richard Smith, 25, said he was not home at the time of the crash but was saddened when he learned of it. “It’s just tragic,” Smith said. “It’s just sad to see a little girl go.”