Hi Momma---First of all, take a moment to step back and look at your DD's genetics. What are you and dad built like? Aunts, uncles? Cousins? That will give you a good idea of where she might end up as she ages. Those charts are averages and so you have to take that info with a grain of salt. At 2, she is learning that she has a voice, and what she puts in her mouth is the easiest way to express that voice and budding decision making. Your job is to give her options you want her to choose from and how to make good choices. Keep offering healthy foods and limit treats, etc. Be sure she doesn't drink too much food as that will dull her apetite for solids.
Vitamin drops are not a substitute for eating adequate fruits and veggies and yes, vitamins, when not needed by the body, in amounts not needed by the body, can cause long term damage. It's a pretty intricate relationship and it's all about balance, balance that is found in food. I would be happy to explain it to you but here is probably not the best venue. It's not difficult to understand but maybe lengthy in content, depending on what level of detail you'd like to know. So feel free to contact me at any time and I will share what I've learned.
First, I probably should say that I am taking a series of wellness classes, taught by a Naturopath who has her PhD in Nutrition. She stresses the 5 areas of optimal health: 1) a plant based diet, fresh fruits and veggies, whole grains, beans/legumes, nuts and seeds; 85-90% plants and the rest can be from the animal kingdom. This means that meat should be more like a condiment/flavoring for soups and stews. Eliminate dairy as cows milk is designed for baby cows. Go to www.pcrm.org and put dairy in the search box. 2) drink lots of filtered water, 3) exercise is essential, 4) get adequate sleep and 5) reduce stress and learn coping strategies to manage stress.
I would recommend finding a local health food store and ask for a whole food based supplement for your daughter if you feel that one is necessary. I happen to think that we do need nutritional help as the food that we do eat is likely deficient in nutrients because they are not vine-ripened, shipped way across the country for us in Michigan and also because we are subjected to more external environmental toxins than ever before. I also have some suggestions there, as well as great resources for recipes, serving size charts, etc. There is so much info available to us these days and much of it is not very good, meaning based on long-term research. We have to be our own best advocate for health. The system that is set up today deals with disease and how to treat it...NOT on how to prevent it.
Hope I've helped...a little...oh, check out www.askDrSears.com and look in his/their Q&A section about picky eaters. You'll get some great ideas there. Take care...feel free to contact me if you'd like to discuss any of the points I've raised. D.