A Pennsylvania teenager sentenced to 35 years to life for plotting with her soldier boyfriend via text message to kill her mother has appealed her case in an effort to get it sent back to juvenile court.

The (Allentown) Morning Call reports (http://bit.ly/1Wu9tLu ) that 15-year-old Jamie Silvonek can't challenge her sentence because she agreed to a plea bargain, but she can ask an appeals court to reconsider a judge's decision to try her as an adult.

If the court agrees, she can only be jailed until she is 21.

Silvonek has agreed to testify against 21-year-old Army Spc. Caleb Barnes at his trial next month.

Prosecutors say the couple discussed killing 54-year-old Cheryl Silvonek for a week. They say Barnes stabbed the woman in her driveway at her home near Allentown.

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Information from: The Morning Call, http://www.mcall.com