BEND, Ore. -- Authorities in Portland said a woman wanted in a gruesome Warm Springs murder case turned herself in on Tuesday.

Crews called to fight a fire on the Warm Springs Indian Reservation last week discovered the body of Lucinda Stwyer, a 24-year-old mother of three.

Multnomah County

Relatives of Stwyer told Bend television station KTVZ that she was involved with meth and had gotten into a physical fight with another woman last week.

On Tuesday, Jolena Jean Warner, 27, was booked into the Multnomah County Detention Center and held without bail on federal charges of first-degree murder after turning herself in, FBI spokeswoman Beth Anne Steele told KTVZ.

Last Wednesday, her family says, Stwyer went alone to a drug deal in the remote Trout Lake area of the reservation. They claim friends of the other woman were there and retaliated.

Family members said six people were involved -- burning Stwyer's hair off, shooting at her and then cutting off her fingertips so their DNA couldn't be found under her nails.

Then they allegedly doused her with gasoline and lit her on fire, burning her alive.

Fire crews were called to the area west of Highway 26 on September 24 on a report of a wildfire burning about an acre of land, which led them to Stwyer's body.

Warm Springs police later learned from witnesses that Warner had told an aquaintance she had stabbed Stwyer in the neck and made her smoke meth, according to court documents.