Siblings of Carlson, who went missing in Grays Harbor County in 2021, say she was kept in a locked cell and their mom Jordan Bowers "physically abused" her.
Investigators have named Oakley Carlson's parents, Jordan Bowers and Andrew Carlson, as main suspects in her disappearance, though neither has been charged.
Jordan Bowers is scheduled to appear in court Monday morning in Grays Harbor County to be sentenced after she accepted a last-minute plea deal in an identity theft case, not linked to her missing daughter Oakley Carlson.
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