Divers spent more than seven hours scouring the cold, inky waters of the Snake River (search), but failed to find the body of a toddler who authorities say was swept into the river by her mentally ill grandmother in a murder-suicide attempt.

Kelley Jean Lodmell (search), 38, described by police as a transient and a paranoid schizophrenic, was charged with murder during her initial court appearance Tuesday from the county jail by closed-circuit television.

"We have reason to believe she intentionally jumped into the river in an attempt to commit suicide and kill the baby," Idaho Falls Police Sgt. Steve Hunt said. "We don't believe the baby going into the water was an accident."

Divers planned to resume the search for 19-month-old Acacia Patience Bishop (search) on Wednesday morning. Dogs and rescue workers patrolled the banks Tuesday trying to pick up the child's tracks while boats searched a couple of miles downriver.

Baby shoes, a doll and one of the woman's shoes were found on the platform where Lodmell said she and the child fell in while dangling their feet in the water, police say. The woman's other shoe was found in the river.

Poor visibility in the murky water hampered divers' efforts Tuesday.

"Visibility is between two feet and sometimes zero. What they're doing is hand work. It's difficult and time consuming," Bonneville County sheriff's Capt. Paul Wilde said. "It's an emotional drain on them. They're doing the best they can do."

Police say Lodmell took Acacia from her great-grandparents' home in Salt Lake County, Utah, on Sunday evening, and a national Amber Alert was issued early Monday.

A combination of interviews and physical evidence secured during searches of Lodmell's hotel room in Idaho Falls and her car led to the murder charge, Bonneville County Prosecutor Dane Watkins Jr. said. He refused to discuss specifics about the evidence.

Lodmell had stopped taking medication for her illness, according to her daughter Casey Lodmell, who is Acacia's mother. The daughter said her mother had wanted the little girl for herself.

Last year, Kelley Lodmell took Acacia for half an hour before relatives found them, Salt Lake County sheriff's spokeswoman Peggy Faulkner said. No charges were filed. Since then, Acacia had only had supervised visits with her grandmother, she said.

Magistrate L. Mark Riddoch ordered Lodmell held without bond in the Bonneville County Jail at least until her June 10 preliminary hearing. She was appointed a public defender.

Lodmell sat passively during the brief hearing, offering only one-word answers to routine court questions.

Federal prosecutors in Salt Lake City are also considering federal charges against Lodmell.

"Certainly there are potential kidnapping charges because of the nature of the offense -- taking an individual from one state to another," said Richard Lambert, criminal division chief for U.S. Attorney Paul Warner.