Preliminary autopsy results say extreme dehydration and heat exposure caused of a death of an 18-month-old girl whose body was found Sunday on a creek bank near Marshall, Missouri. Saline County Sheriff Wally George says the girl’s mother was hospitalized, and investigators haven’t been able to talk to her about what happened to her daughter.

The mother showed up disoriented at a stranger’s house near Marshall on Saturday night and said she recalled leaving her daughter near a creek. The woman’s car was found abandoned Thursday.