Tyler, Texas ? A woman charged with bludgeoning two of her sons to death with rocks and critically injuring a third child may not understand the capital murder and aggravated assault charges against her, her attorney said in court Monday.

Two days after Deanna LaJune Laney, 38, called 911 to report killing two of her sons, the petite woman appeared in court, wide-eyed and nodding responsively when District Court Judge Cynthia Kent asked her whether she understood her rights.

Laney’s newly appointed attorney, F.R. “Buck” Files, questioned Laney’s understanding of the situation.

“I’m not sure if she can truthfully say she understands what is going on,” Files told the judge.

Laney is accused of killing Joshua Laney, 8, and Luke Laney, 6, and injuring their 14-month-old brother, Aaron. The toddler remained in critical condition Monday at a Dallas hospital.

In a call to emergency workers early Saturday, Laney reported that she had just “bashed their heads in with a rock,” Sheriff J.B. Smith said.

The sheriff said Laney acted erratically Sunday during interviews with investigators.

“Sometimes she is incoherent, sometimes she’s in a fetal position and sobbing. Sometimes she’s singing spiritual hymns or muttering about God and sometimes she has a flatliner (poker) face and not saying a thing during interviews,” Smith said.

At a news conference after the hearing, Dist. Atty. Jack Skeen said he knew of no evidence to suggest that Laney suffers from mental health problems or was confused about her circumstances.

The district attorney said it was too early to decide whether to seek the death penalty.

Bail for Laney has been set at $3 million.