What/whom gave you the idea that craving ice is a sign of iron deficiency? Please let me know so I can find that on my own to check it. I make more iron than my body need and I love ice...it's a great way to help me lose weight, instead of putting food in my mouth I simply put some ice in there.
In the meantime, the following website provides a list of symptoms of iron deficiency which i have copied to this message. Ice chewing or craving is not among them. If you are worried about your daughter's iron levels take her to the pediatrician and have them checked, it is a safe simple stick in the finger and takes like 5 minutes.
"What are the Symptoms of Iron Deficiency Anemia?
"There are many symptoms of anemia. Each individual will not experience all the symptoms and if the anemia is mild, the symptoms may not be noticeable. Some of the symptoms are: Pale skin color, fatigue, irritability, dizziness, weakness, shortness of breath, sore tongue, brittle nails, decreased appetite (especially in children), headache - frontal"
http://www.mamashealth.com/nutrition/anemia.asp
I hope this helps with your situation... ;-)