Philomena Brown, 49, was arrested at about 9 p.m. Monday upon her release from a hospital where she had been placed under observation after San Mateo County sheriff's deputies found her at a beach near Half Moon Bay, Redwood City police Sgt. Sean Hart said.
She has been booked into the San Mateo County women's jail on suspicion of attempted murder and assault with a deadly weapon.
Officers responded to her home at 1010 Vera Ave. at about 5:30 a.m. Monday on reports of an assault. Brown's 23-year-old daughter and 13-year-old son were found injured and taken to Stanford Hospital, according to Hart.
The daughter had a skull fracture and it appeared she had been struck in the head with something, Hart said. She was listed in stable condition today.
The son complained of pain but was released later Monday, and their father John Brown was not injured.
Philomena Brown was found at Pomponio State Beach near Half Moon Bay at about 2 p.m. Monday after San Mateo County sheriff's deputies spotted her car in the beach's parking lot.
She was taken to a hospital for observation but released that night and promptly arrested, Hart said.
He said she declined to give a statement to police, and detectives are still working to establish a motive.
A next-door neighbor said he was surprised by what happened and called the Browns "a regular, hard-working family."