Police arrested Chandramathy and her husband Govindan this morning at Payannur after a video clip of the assault went viral on the social media yesterday.
A case was registered against them under various sections of the IPC including 323 (punishment for voluntarily causing hurt) and 324 (voluntarily causing hurt by dangerous weapons or means) on a complaint filed by Chandramathy's brother, police said.
Police said the elderly woman was ailing from severe memory loss and her daughter had thrashed her angered over her bedwetting.
Police have shifted Karthiyani Amma to a taluk hospital.
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