COVINA, Calif. (KABC) -- A 43-year-old woman allegedly stabbed her 61-year-old mother to death at a convalescent hospital in Covina on Monday.Covina police responded to a call of a woman not breathing in an assisted living care facility in the 800 block of W. San Bernardino Road and found 61-year-old Margaret Machiko Yamaguchi on the floor of her room with numerous stab wounds. She was pronounced dead at the scene.Police said the victim's daughter, 43-year-old Athina Sumi Rivera, was spending the night in her mother's room and is a suspect in the crime.Rivera was taken into custody on murder charges, and she is scheduled to be arraigned at Citrus Superior Court on Wednesday.Her bail is set at over $1 million.Anyone with information or questions regarding the crime are asked to contact the Covina Police Department Detective Bureau at (626) 384-5612, or contact Crime Stoppers at (800) 222-TIPS (8477).You can refer to Covina PD with the case number: 15-13310.