It is also very normal for kids to seem to exist on one food, eg peanut butter and jelly, macaroni and cheese, pizza, etc. You can try and balance the meals out by offering other foods they like. If your daughter refuses vegetables, try offering more fruit instead. Fruits and veggies offer pretty much the same nutrients and so can be interchangeable in her diet. Maybe you can find a different way of serving the vegetables that will make them more appealing to her.
Kids love to dip.
Try serving fresh vegetables with a dip she would enjoy. I encourage you to plant a vegetable garden with her this summer. There is nothing like taking ownership in the raising of vegetables to get a child to eat them. You should see the neighborhood kids join my kids in their garden in pulling up the ripe carrots, hosing them off and then eating them right there in the back yard. They also love walking through the pea patch and eating the peas fresh out of the pod.