From the measurements you wrote, her weight is below the 5th percentile and height is on the 5th percentile for her age. Some children are small for their age due to genetics. Have you tried nutrient dense drinks, such as Pediasure or Carnation Instant Breakfast Drink? These drinks should be in place of milk for extra calories and protein. Make milkshakes with Pediasure with ice cream, and fresh fruit or frozen fruit, and then she will have additional calories, protein, and vitamins and minerals. Thank you for your question.