SUNNYVALE — An 81-year-old woman was killed with a hammer at the hands of her daughter after an argument Thursday in the Sunnyvale home they shared, police said.

Linde Adrienne Smith, 50, was arrested and booked into the Santa Clara County jail on suspicion of murder after the afternoon slaying at their home in the Plaza del Rey mobile-home park off Tasman Drive and Lawrence Expressway.

Smith was the person who called police around 12:50 p.m. to report what would soon be classified as the city’s first homicide of the year, according to the Sunnyvale Department of Public Safety.

Officers arrived, searched their home and made the gruesome discovery: the body of Anne Frances Smith with blunt-force injuries, alongside a hammer that is believed to be the weapon used, Capt. Jeffrey Hunter said.

An argument preceded the alleged attack, but police did not release additional details, including a precise motive, citing the ongoing investigation.

Anyone with information about the case can contact Sunnyvale detectives at 408-730-7120.

Contact Robert Salonga at 408-920-5002. Follow him at Twitter.com/robertsalonga.