Question: Who is the maternal grandmother of André De Laval-Montmorency?
Answer: Jeanne de Laval-Tinténiac

Anne de Laval (1385 – 25 January 1466) was a medieval French noblewoman. She was the daughter of Jeanne de Laval-Tinténiac and her second husband (died 1412), governor of Brittany and baron of Laval (Jeanne's first husband had been Bertrand du Guesclin). André de Laval-Montmorency, seigneur de Lohéac (1485) was a Marshal of France