Thurston County sheriff's detectives arrested Monique Hachtel early Thursday morning on suspicion of second-degree murder in connection with the death of her 2-year-old daughter earlier this week.
Hachtel's 2-year-old daughter, Kelsy, died early Tuesday morning after being taken to a local hospital from a Tanglewilde residence where she resided.
Sheriff's deputies and emergency responders rushed to the scene about 1 a.m. Tuesday after a 911 call was made from a residence in the 7700 block of Third Avenue SE. The caller said the 2-year-old was unconscious and CPR was in progress.
On Wednesday, Thurston County Coroner Gary Warnock said the child died of multiple internal injuries due to blunt force trauma.
The child likely suffered her injuries days before she was taken to the hospital on Tuesday, Thurston County Sheriff's Sgt. Ray Brady said.
"The injuries to this little girl were clearly the result of a brutal attack and act of violence," Brady said.
Brady said Hachtel has denied harming her daughter. However, detectives have a timeline of when they believe the girl suffered her injuries, including a lacerated liver, and "the mother was the only one alone with the child at that time," he said.
"This was a horrible, horrible beating," Brady said.
Detectives have been unable to come up with a motive as to why the girl's mother would want to harm her, Brady added.
Hachtel, 25, will have her first court appearance Thursday afternoon before a Thurston County Superior Court judge.