DS who is 3.5 is similar in that he has a very limited diet - he is the opposite, will eat any type of meat/fish/chicken/eggs ie protein as well as dairy but refuses vegies in any way shape or form and has extremely limited fruit ie bananas, sultanas and puree fruit. MY oldest DD on the otherhand eats EVERYTHING so we dont know what happened.

We go through phases where sometimes we try to "force" him to eat certain foods and he will in all honestly gag after 1 or 2 bites so we just think its not worth the effort and distress. He is not an unhealthy boy by any means and I manage to sneak vegies in to some foods.

Unless it is worrying you I kind of think just let her be, especially if you are managing to get some fruit and veg into her. Maybe try giving her a multi vitamin if you are concerned (DS even refuses these).