September 10, 2014 3:50 PM EDT

A 19-year-old Colorado woman pleaded guilty on Wednesday of conspiring to support Islamic State of Iraq and Greater Syria (ISIS) fighters, the U.S. Department of Justice said.

Shannon Conley of Arvada, Colo., confessed to making online contact with a self-confessed member of ISIS. According to the plea agreement, Conley pledged, over a series of conversations, to marry a fighter in Syria, to provide tactical support to the organization and to engage in combat herself if necessary.

Conley joined the U.S. Army Explorers to gain training in armed combat, according to the Department of Justice, and even ignored warnings from federal agents to steer clear of a U.S.-designated terrorist organization. Conley was arrested at Denver International Airport on April 8 as she was attempting to board a flight to Turkey.

She faces a maximum sentence of five years in prison and a possible fine of up to $250,000. Conley will stand for sentencing on Jan. 23.

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