Pediasure is loaded with sugar; I would avoid it. Your daughter is probably in what I call the air-o-tarian phase. They all go through it. First, make sure that she is drinking water, so she doesn't get dehydrated.
Most important, do not create a monster who only eats nuggets, mac and cheese and hot dogs.
Just keep offering a variety of healthy foods, and eventually she will start eating.
Frozen foods are fun to play with, and will get eaten, like peas, blueberries and corn. Chunks of avocado and tofu are loaded with great nutrition, and are fun to squish between little fingers.
I have never met a toddler who wouldn't eat hummus (lots of calcium, protein, good fats and iron), you can mix it with a mashed egg.
Offer cut fruits with yogurt dip, fresh veggies with hummus or salad dressing, cooked whole wheat pasta and veggies with marinara or peanut sauce or cheese sauce.
at 8:43 PM on Dec. 10, 2009