ST. AUGUSTINE, Fla. -- A St. Augustine woman charged with attempted murder after she allegedly ran down two brothers and tried to hit a third Sunday afternoon is being held without bail on charges of attempted murder.

Kathy Allen, 47, was arrested after witnesses saw her drive her SUV into the two boys after a golf ball they were playing with struck her vehicle. One of those teens remains in critical condition.

According to the St. Johns County Sheriff's Office, Isiah Grayer, 13, and 16-year-old twins Justin and Jamel Marshman, were bouncing a golf ball in a parking lot on State Road 16 about 2:45 p.m. when it got away from them and hit Allen's Chevrolet Blazer.

Authorities said there was no damage to the vehicle, and the brothers went over to apologize, then turned to walk away.

According to witnesses, Allen started driving to the other side of the parking lot, then accelerated toward the boys.

"She did a purposeful U-turn and started to accelerate toward the boys," St. Johns County Deputy Ricky Domingo said.

Police said she drove over several curbs and through landscaping to hit the two boys and knocked down a light pole. Police said she then turned her SUV toward the third brother, but the vehicle got stuck in drainage ditch and he was able to run away.

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"The lady came back around, charging us. I ran one way, my two brothers ran the other way," Jamel Marshman told Channel 4's Hetal Gandhi Monday. "I'm shocked and surprised why she would do it. That's not even normal."

Grayer was flown to Shands-Jacksonville Medical Center, where he was reported in critical condition with head injuries. Justin Marshman was initially taken to Flagler Hospital, then transferred to Shands, where he was released Monday. Jamel Marshman was not injured, but he said he would stay by his brother's side at the hospital.

The boys' family is angry and wants Allen to serve time.

"She deliberately tried to kill my grandkids," said Rebecca Lofton. "Justice needs to be served. If I ran over her grandkids where would I be?"

Allen's mother, Betty Newell, rushed up from Melbourne when she heard. She said she can't believe Allen would do sucha thing.

"I don't know what happened to her," said Newell. "She's a wonderful person, she's a churchgoing person."

At her first appearance Monday morning, Allen told the judge, "I'm mentally ill." The judge ordered her held without bond on the attempted murder charges, and told her that if Grayer were to die, the charges would be upgraded.

Along with witness statements, investigators found acceleration marks on the road. Allen was questioned at the scene Sunday, then arrested.

"The lady was smoking a cigarette, thinking nothing had happened," Jamel Marshman said. "I asked her why she hit us for. She said we threw a rock at her. I know we didn't throw a rock; I told her it was a golf ball."

"I saw her just charge right at him. It was insane. I've never seen something as cold and calculated at that. She just wanted to hit them," witness Russell McPee said.

Allen is married and has a teenage daughter. Her family said this is completely unlike her.

"If the kids were throwing rocks at her, she probably felt like anybody else would," Newell said. "She would never hurt anything."

Police said Allen has no criminal record. They took blood samples from Allen at the scene to see if drugs or alcohol contributed to her alleged actions.