The 5-year-old girl, identified as Adrianna Mejia-Rivera, died at the scene.
"It's very sad, it’s very sad because it’s a kid," Carlos Valencia, a family friend of Mejia-Rivera, said.
A 2-month-old was taken to the hospital where she remains in the intensive care unit. A third child and two adults were hospitalized with less serious injuries, as well as a 30-year-old passenger in Harris' car.
Mejia-Rivera's uncle visited the site where she died, and said that close family was still at Massachusetts General Hospital with the baby in the ICU.
Outside of Chelsea District Court Monday, the mother of the woman behind the wheel of the SUV said she called her shortly after she was arrested.
"I feel so bad for those kids," said Harris' mother, Maureen Harris. “She said, ‘I don’t know. All of a sudden, it just happened.’”
Officials say Autumn Harris allegedly stated she had consumed one beer earlier in the afternoon, had taken prescription and over-the-counter medication to help her sleep the night before and that she had only slept for two hours before working all day Sunday. Autumn Harris allegedly said she had vaped CBD oil in the vehicle and may have nodded off at the wheel.
“She’s had a deteriorating spine and a lot of issues with it," Maureen Harris said.
Autumn Harris was unable to take a breath test, according to the DA. Investigators obtained a search warrant for a blood sample and her cell phone to help them figure out if she was impaired or distracted.
Maureen Harris said her daughter's heart is broken and she is "obviously in shame."
She is due back in court on Jan. 10.
A GoFundMe page has been set up for the funeral arrangements for Mejia-Rivera. The page can be found by clicking here.
– The Associated Press contributed to this report.
Support real journalism. Support local journalism. Subscribe to The Atlanta Journal-Constitution today. See offers.
Your subscription to the Atlanta Journal-Constitution funds in-depth reporting and investigations that keep you informed. Thank you for supporting real journalism.