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FREDERICK, Md. (WUSA9) -- Frederick County Sheriff's Office arrested a 58-year-old woman Thursday, who assaulted a 92-year-old woman with dementia in Frederick.

According to authorities, a woman hired 58-year-old, Terry Freland, of Frederick to care for her 92-year-old mother back in December.

The woman started noticing injuries on her mother over the past few months. She decided to put a hidden video camera in the house to see Freland interacting with her mother, authorities said.

The video showed the woman verbally and physically abusing the 92-year-old woman, officials said.

The incident is still under investigation. Freland was taken to the Frederick County Adult Detention Center's Central Booking Unit for processing, authorities said.

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