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PHELPS COUNTY, Mo. (KSDK) – An Endangered Person Advisory has been issued after a four-year-old went missing from Rolla on Monday.

Cassandra Robertson went missing from the 11800 block of State Road V. The suspect is believed to be her 39-year-old mother Nikie Robertson, who police say has a history of suicidal tendencies and substance abuse.

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They may be on their way to Las Cruces, N.M. or Colorado via unknown routes.

The vehicle is described as a silver 2006 Nissan Quest with Missouri license plate FG2D5J.

Cassandra Robertson has an eye infection that requires medication. She is described as 40 pounds with blues eyes and brown hair. She was last seen wearing a gray zippered shirt with a Hello Kitty logo.

Nikie Robertson is 5'6", brown hair, green eyes and was last seen wearing a black shirt and blue jeans. Anyone with information should call 911 or the Phelps County Sheriff's Department at 573-426-3860.