In her farewell letter as she was leaving to join the Islamic State of Iraq and Syria (ISIS), Jaelyn Young told her family she was guilty.

“I found the contacts, made arrangements, planned the departure,” prosecutors say she wrote last August. “I am guilty of what you soon will find out.”

Tuesday, she admitted the same to a federal judge in Aberdeen, Mississippi, pleading guilty to one count of conspiring to provide material support to a terrorist organization.

U.S. District Judge Sharion Aycock will sentence the 20-year-old Young at a later date. The former Mississippi State University student faces up to 20 years in prison, $250,000 in fines and lifetime probation.