The incident happened less than a week after another school principal was attacked in her office in Malolos City.
Superintendent Noli Pacheco, municipal police chief, identified the victim as Rosalina Lazaro, 74, former principal of Bulacan Academy here and mother of lawyer Maria Teresa Lazaro, a consul at the Philippine Embassy in Australia.
Pacheco said the robber entered the septuagenarians home in Barangay San Jose through the comfort rooms window.
Police said the old woman might have been awakened as the robber was ransacking the place.
Pacheco said the victims 12-year-old granddaughter Mazel was roused from sleep by the commotion inside her grandmothers room.
"She entered the room and saw the (robber) who was about to leave," he said. The girl described her lolas attacker as about 20 years old and wearing a black shirt and a red baseball cap. Dino Balabo, Ric Sapnu