LINCOLN, Maine — A 6-year-old girl hit by a bus last week is now in stable condition, and investigators hope to interview her Wednesday to determine what caused the accident, Police Chief William Lawrence said.

“I heard just a little while ago that she is stabilized and doing well,” Lawrence said Monday after a conversation with the girl’s father. “It’s awesome, just great. I am happy for the kid and her family.”

RSU 67 bus driver Casey Voisine was dropping off Ella P. Burr Elementary School and Mattanawcook Junior High School students at Ariel and Clark streets at about 2:45 p.m. Wednesday when first-grader Sophia Nelson of Lincoln was hit by a wheel of the bus or the undercarriage, police have said. Sophia had left the bus and came clear of it just before being struck.

Per standard procedure, school officials placed Voisine on administrative leave with pay Thursday and police administered an alcohol-content test on a blood sample of hers. Police don’t expect to see any malfeasance, Lawrence has said. They interviewed her immediately after the accident.

Lawrence and Detective David Cram, who is the accident’s lead investigator, came upon the accident minutes after it had occurred and Cram radioed Penobscot County Regional Communication Center dispatchers to send an ambulance, Lawrence said Monday.

The two had just left a meeting at a nearby health care facility and were on nearby Edwards Street when they saw a small body lying in the center of the road and the bus parked nearby.

“And I heard somebody screaming for help,” Lawrence said. “I said, ‘Let’s go see what that is.’”

Lawrence saw immediately that while Sophia was crying and talking at the scene, he could do little for her.

“I could tell by her condition that she could not be moved,” Lawrence said. “We just made sure she was stabilized.”

If the interview occurs Wednesday, police might complete the investigation by Friday, Lawrence said.