The doctor will check if there is any underlying cause of her anemia, it may not necessarily be her diet as I am sure there will be kids that don't touch any fruit or veg, she might simply be a bit run down after a bug, presumably you had a reason to take her to the docs in the first place.
Green leafy veg and red meat are the best sources of iron, but if your daughter is not keen on these, there are plenty of other sources that might be a bit more palatable to her, what about baked beans or lentil soup. It is often easier to hide vegetables in blended soups. A lot of foods are fortified with iron - breads for instance, or you could give her a vitamin supplement for a while.
I would wait 'til they get the results back, she may not be anemic at all - she may jsut be recovering from a bug and needing some time to build herself up again.