Offer her lots of different kinds of food. Does she like Jello? Pudding? Crackers? Cut-up fruits?

Have you consulted a doctor about this?

Kids are all different, two of my girls I thought would starve before they were in kindergarten and one who I was afraid to put my hands near when she was eating.
All healthy beautiful adults now.

Log everything she eats for a week, you may be surprised at how much she is eating.

Have a tea party for her and her dolls, get her to help make sandwiches and fruit for the party, then sit down and have some fun!

Smoothies are packed with vitimins and very tasty, have her help you prepare meals,some easy like mixing, or baking! Offer a wide range of foods on a regular basics.

Give her a plate of food at meal times and just act normally, when she does eat praise her to high heaven.

If your very concerned consult a doctor.