JACKSONVILLE, North Carolina (CNN) -- It's possible that a pregnant Marine missing since December 14 may have left willingly, perhaps after being upset by a phone call, documents released Thursday by Onslow County authorities show
Those records were bolstered by comments made by the county sheriff who pleaded for 20-year-old Lance Cpl. Maria Lauterbach, who is eight months pregnant, to come home.
The young woman's mother, Mary Lauterbach, told authorities that her daughter has a history of being a "compulsive liar," a police report states.
Mary Lauterbach described having a "firm conversation" with Maria Lauterbach about her unborn baby, telling her she should give the baby up for adoption because she is unable to care for it.
"Ms. Maria Lauterbach was telling Mary Lauterbach everything was fine, but Mary Lauterbach had a sense that the statements were not accurate," the report said.
Lauterbach last spoke to family members in the Dayton, Ohio, area on December 14. They reported her missing on December 19 after being unable to contact her.
Documents attached to a search warrant in the case cite the Marine's mother as saying Lauterbach had been the victim of a sexual assault by a superior officer.
Onslow County Sheriff Ed Brown said Thursday his office had not talked to the person accused in that case and referred any other comment to the Marine Corps. Officials at Camp Lejeune, North Carolina, where Lauterbach is based, have not commented on the assault allegations.
Earlier Thursday, Brown pleaded with Lauterbach to come forward and get help.
"Regardless of the circumstances, this has got to stop," Brown told reporters. "You can't run from those things in life."
While he would not say definitively that authorities believe Lauterbach is alive, Brown said he is leaning toward a positive outcome. "You pray that she's alive," he said.
Mary Lauterbach said her daughter claimed to have been sexually assaulted by a senior officer, but the military investigation had "gone sour," according to the Onslow County reports.
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Police: Mom told us pregnant Marine is a 'compulsive liar' - CNN.com