Can my child get social security her father has died and he was getting disability and social security from his mother?

Your child cannot receive the money that her father was drawing on his mother's social security (I guess he was disabled before age 22?). If her father had put in to Social Security on his own, from his own work or if he was receiving Social Security Disability on his own work record then she would probably be entitled to some money depending on her age (either survivor benefits or a continuation of her benefit based on her father's Social Security Disability).