Hi,
Of course, I would suggest she consult with her own team of Docs, nutritionists, but I would say, the obvious of cheeses, whole milk (which I would keep her on after she hits 2 yrs. old even), pastas, bagels, smashed avacados mixed with another fruit, or chunks of it if she'll pick it up and eat it plain. With trying to keep it healthy, I would also suggest turkey meatballs, scrambled eggs with a bit of cheese mixed in. With cooking for her, say Mac-Cheese, mix in whole milk, butter, but also pureed brocolli, to get / keep her healthy with greens. Her docs may also suggest special weight gain shakes packed with all of the good stuff to put some meat on her bones. I mean, under 2, they always say to give them as many good fats as possible. Too bad she's a bit too young for peanut butter, b/c that would be a good thing. I really hope this special little girl gets what she needs and I know she'll be moving in no time. I'll be thinking of her.