My 19 month old twins go back and forth on eating.  Right about a year is when it started.  Some times they eat so much I have to keep going back for new foods, other times they hardly eat a thing.  Everything that I've researched says that it's normal.  They are at an age when they realize that there will be other meals served so they don't "have" to eat right now, this is one of the few things in their world that they are realizing they have control over.  So it's part of their gaining independance.  Just offer foods like you always have but don't worry or get upset if they refuse to eat.  They will eat when they get hungry.  My pediatrician recommended that for some reason toddlers always seem to do good at snack time so take advantage of that. 

I remember my daughter did the same thing.  Her favorite baby foods - wouldn't touch when in small pieces.  No, they won't starve themselves  and will come around eventually. Finely at school age she eats what we eat or their is always peanut butter in the cupboard.   Hang tough.

I found that my son always got really picky when his teeth were on the move. He has always been a fantastic eater and I'm really lucky for that, but when the teeth were cutting it was hell.

On the other hand now that he's three, it's more of his testing the boundaries (unless of course he's sick). So I can totally understand your concern. Here I had a kid that would eat anything and was always saying he was hungry ( he goes through about $20 fruit per week ...no joke!), to a kid that would play up at every meal time. Unless of course his grandfather was about and would be aperfect angel. So I fussed and stressed for a little about it, then decided to take the approach that if I react to his behaviour it will only increase and get worse. I've seen the same thing happen with my nephew...and it is bad. So if he says he's not hungry or doesn't want to eat, I tell him ok and to leave the table. He is also made aware that he doesn't get anything until the next meal time, no if's but's or maybe's. He won't starve and he has realised that mealtime is mealtime, and if he decides not eat then or play up, then bad luck...

it happens.  Toddlers don't grow so quickly, so their energy requirements are lower because of that.  If she eats the food you offer, then you are doing well.  She will still have days when it will seem like you are feeding her the entire supermarket, but that is to be expected too.

That would be my son. He ate everything I put in his mouth as baby, but from 18 month old on he got very very picky. Eating was constant battle in my house... it's just recently gotten better at 3 years old!

I know this is hard to practice, but the advice I've been given is to offer the child a variety of food. If the child doesn't want to eat, then don't force because sooner or later they will get hungry and eat. They won't starve themselves.