TACOMA, Wash. -- A former elementary school teacher has been charged with kidnapping a 10-year-old student and is suspected of raping him multiple times.

Jennifer Rice, 31, was arrested Saturday and booked into the Pierce County Jail for investigation of kidnapping, five counts of first-degree child rape, and four counts of child molestation.

On Monday she pleaded not guilty in Pierce County Superior Court to a charge of kidnapping with sexual motivation, and prosecutors said more charges will follow.

Tacoma police spokesman Mark Fulghum said Rice was working as a contract teacher at McKinley Elementary School earlier this year and the alleged victim was a student in her class.

The boy's father told investigators that until about one month ago, Rice had come to their house several times to take the boy to movies, and often talked to him online. The father was concerned about the nature of the relationship and told the woman not to come back, Fulghum said.

On Saturday the man woke up and discovered that his son was not home and his bed had been made to look like he was sleeping.

"So sometime during the early morning hours, he disappeared from the house," Fulghum said.

According to court documents, Rice told detectives that she picked the boy up, took him out to breakfast and took him to a waterfall.

Rice said she had planned to take him to Idaho, but after police called her the boy asked to be dropped off at his uncle's house in Puyallup. He planned to make up a story about where he had been and tell his parents he had walked there.

Investigators said that Rice admitted that she raped the boy at a rest stop in Ellensburg before driving him back, and court documents indicate that the two had intercourse several times on previous occasions, including once in the boy's home.

"I'm disgusted. It's just, I can't even talk right now," said Toyanne Rhodes, whose 10-year-old son was Rice's student at McKinley. "She was a good teacher. She was nice. If I ever had any questions I could call her anytime. I could talk with her, pop into her class anytime I wanted. I never would have thought."

According to the Tacoma School District, Rice taught at McKinley from October 2006 to April 20, 2007. At that time she was placed on administrative leave while the district conducted an investigation to determine whether she was socializing with her students after school.

Details of the investigation were not available, but the district did not renew her contract.

Rice is being held in lieu of $500,000 bail and could face up to 25 years in prison if convicted.