When Araceli Camacho Gomez, 27, was found Friday, her hands and feet were bound with yarn and she had “massive trauma to her stomach area,” court documents said.

Phiengchai Sisouvanh Synhavong is accused of attacking Camacho Gomez and trying to pass the infant boy off as her own, officials say.

The 23-year-old Kennewick woman appeared in Benton County Superior Court Monday afternoon. She was ordered held without bail in the county jail.

Sisouvanh Synhavong’s arraignment on first-degree aggravated murder is set for Wednesday morning. If convicted, she faces life in prison without parole, or prosecutors could seek the death penalty.

Kennewick Police Chief Ken Hohenberg and Prosecutor Andy Miller didn’t release many details of the case during a news conference after the court hearing, saying they didn’t want to jeopardize the investigation.

“It’s less than 72 hours into the investigation,” Hohenberg said.

The baby was at Deaconess Medical Center in Spokane in critical condition on life support, Hohenberg said.

Blue mechanic’s gloves soaked in blood, a box cutter, bloody paper towels, yarn, a mucus bulb, a baby bottle and baby socks were among the items found in the defendant’s purse, court documents said.

Officials wouldn’t say whether the box cutter was used to stab or cut the victim. Court documents did, however, reveal a partial timeline of the events late Friday.

Sisouvanh Synhavong called 911 at 11:04 p.m. saying she was by JCPenney, had just given birth and that she thought the baby had died.

The call ended but dispatchers traced it to an area in Columbia Park. Seven minutes later, the defendant called again and the call was traced to an area about a mile away from the park. Sisouvanh Synhavong was found in the parking lot with the baby, holding what appeared to be an umbilical cord. A “significant amount of blood and pieces of human tissue” were found in the back seat, documents said.

The defendant and the baby were taken to Kennewick General Hospital, where medical tests showed she had not recently given birth.

An autopsy conducted Saturday showed that Camacho Gomez, of Pasco, died of a loss of blood, primarily from four stab wounds to her chest, Coroner Rick Corson said.

Cuts in her uterus also were consistent with the body being cut to remove an unborn child, court documents said.

Camacho Gomez’s 10-year-old son, Carlos, told a family friend Sunday that the last time his father saw his mother was at about 6 p.m. Friday. Juan Campos Felipe took the boy and his 2-year-old sister to a Pasco supermarket to cash a check and buy groceries.

When they returned home about 9 p.m., the front door was open, the electricity was on and the telephone was missing, said the friend, Maria Durrant.

Carlos told her that a “Chinese” woman had picked up Camacho Gomez and the two children at the bus stop earlier that day and given them a ride to Griggs Department Store in Pasco.

That’s when the woman asked Camacho Gomez how far into the pregnancy she was, Durrant said. Camacho Gomez said she had two more weeks until her due date and that she was expecting a boy.

The woman said she had baby clothes for a boy that she would give her, so Camacho Gomez gave the woman her address and phone number, Durrant said.