Picky eater toddler.

My 20months baby girl weigh at 8.5kg. She is a picky eater. And sometimes only eat 1 meal a day. But shes drinking milk as per normal. Iam feeding her with abbott grow and pediasure. Doctor say it's normal. I just got to feed her with alot of protein. She is active baby btw. Any vitamins recommedation for her ? #advicepls