When the mother, who has not been identified, came home around 10 p.m., she found her daughter was unresponsive, according to WZTV.
The mother took Laylani to a hospital, where doctors determined she had extensive head and internal injuries. Laylani died Sunday as she was being taken to another hospital.
Riley told investigators the injuries were caused by a fall; however, the injuries were not consistent with a fall, according to WZTV.
Riley was arrested and charged with first-degree murder and aggravated child abuse, according to the Davidson County Sheriff's Office.
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