A woman is due in a tribal court in Montana on Tuesday to face charges in the alleged beating death of a 13-month-old girl under her care on the Fort Peck Indian Reservation.

Investigators say 42-year-old Janelle Red Dog killed Kenzley Olson and put her body in a dumpster before reporting her missing April 19.

That triggered an Amber alert for Kenzley in Montana and North Dakota. It was canceled after Red Dog purportedly confessed and led authorities to the girl's body.

Red Dog's lawyer has said she admitted to authorities that she struck Kenzley on three occasions. But defense attorney Mary Zemyan said it was uncertain if that's what killed the girl.

The baby's mother was in jail on unspecified allegations when she died.

Tribal officials haven't disclosed what charges Red Dog will face. Federal officials expect to file separate charges.