An eight-grade girl accused of conspiring with her soldier boyfriend by text message to have her mother killed must remain in adult jail while awaiting trial, a judge. A defense petition to return 14-year-old Jamie Silvonek to the juvenile facility where she was initially sent after the body of 54-year-old Cheryl Silvonek was discovered last month was denied by Lehigh County Judge Maria Dantos on Friday. District Attorney Jim Martin had opposed the petition on behalf of the teenager, who is charged as an adult with homicide and criminal conspiracy. Her boyfriend, Caleb Barnes, 20, who is from El Paso, Texas, but was stationed at Fort Meade, Maryland, is charged with homicide. JamieSilvonek, the eighth-grader accused of conspiring with her soldier boyfriend by text message to have her mother killed must remain in an adult jail while awaiting trial, it was ruled on Friday . Cheryl Silvonek's body was found with stab wounds in a shallow grave about 50 miles northwest of Philadelphia, and her vehicle partially submerged in a pond a few miles from the family home. Jamie Silvonek was sent to the county jail this month after she was charged as an adult and is in the women's housing unit, away from older inmates, county officials said. Authorities said Barnes and the teenager met in October, when she was 13, but she told him she was 17. Records show the 14-year-old was upset that her mother had shown her boyfriend her passport as proof that Silvonek was not 17. The teen's mother found out about their relationship in early March and ordered them to end it. A day later, the teen told Barnes in a text message, 'I want her gone,' police said. On March 14, Cheryl Silvonek learned that Barnes intended to take her daughter to a concert in Scranton. 'He is not coming to this house,' Cheryl Silvonek texted to her daughter, who had taken the SAT college entrance exam that morning, according to a police affidavit. The eighth-grader sent her mother a text in response begging her to let them go. 'Mom, if I can't go I'm going to have a mental breakdown,' she said, according to the affidavit. 'I need to go and I need to be with my friends. I feel so desolate mother.' Cheryl Silvonek agreed to drive her daughter and Barnes to the show. On their way, the teenager and her boyfriend continued exchanging messages. 'I love you. We can do this. We'll just drive her car then, right?' Jamie wrote, the affidavit said. Barnes replied in a text, 'No. That leaves us as the suspects.' The three drove back to the Silvonek home after the show, and Barnes allegedly stabbed Cheryl Silvonek. The couple then ate at a restaurant and went to Walmart to buy gloves, bleach and other cleaning supplies, authorities said. Police found the body in a shallow grave a few miles from the Silvonek home. The victim's blood-soaked car was found submerged in a pond nearby. Investigators were able to trace the car back to the Silvonek home. When they arrived, they found Barnes, the girl and Silvonek's husband, David. The girl and Barnes were in an upstairs bedroom and the father was still asleep, CBS 13 reported. Barnes was previously charged with criminal homicide, abuse of a corpse and statutory sexual assault. There is evidence he had sex with the girl shortly before the killing, according to police. The 14-year-old was charged earlier with abuse of a corpse, tampering with evidence and hindering apprehension. 14-year-old JamieSilvonek allegedly conspired to kill her mother Cheryl Silvonek with her 20-year-old boyfriend 'because she disapproved of their relationship' Barnes confessed to stabbing Cheryl Silvonek in the neck multiple times while they were in Silvonek's car, and Jamie Silvonek admitted she was there when he did it and helped dispose of the body, according to an affidavit of probable cause. The teen's attorney, John Waldron, said Thursday he believes his client was under Barnes' control, and that given the age disparity 'there has to be some type of duress or coercion'. He said his client 'cried incessantly and told me how much she missed her mom' and she feared for her life and that of her father. Waldron said he intends to have Jamie Silvonek examined by a forensic psychologist and will petition to have the case moved to juvenile court. Silvonek's attorney said the girl tearfully told him she missed her mother, and claimed she was coerced by her soldier boyfriend and afraid for her life . Police found the body of Cheryl Silvonek in a shallow grave a few miles from her home. The victim's blood-soaked car was found submerged in a pond nearby .
The defense petition to return Jamie Silvonek to the juvenile facility she was initially sent to was denied on Friday .
Jamie Silvonek has been charged as an adult with homicide and criminal conspiracy .
Her boyfriend Caleb Barnes, 20, is charged with homicide .
Cheryl Silvonek's body was found stabbed in a shallow grave about 50 miles northwest of Philadelphia .
Authorities said Silvonek met Barnes when she was 13 but said she was 17 .
Before the killing Silvonek allegedly texted Barnes 'I want her gone'