Carmela Dela Rosa suffered from major depression that was worsening in the months before she tossed her 2-year-old granddaughter to her death at Tysons Corner Center, the woman’s friends and doctors testified Thursday. Dela Rosa is charged with murder in the November 2010 killing of Angelyn Ogdoc. Her attorneys say she was legally insane when she threw the toddler over a sixth-floor walkway connecting the mall and a parking garage.