Former anemic ice-cube chewer here![8D]
I think, as I was discussing my deepening anemia with my sister-the-nurse all those years ago, she came out and ASKED if I had this mad urge to chew ice cubes ([:0][8)])....she said it's a known sign of anemia......my other madness was tortilla chips....talk about 'full on JONES' if I began to see the bottom of the bag....total PANIC. A very wise herbalist friend saw this and suggested that my body was CRAVING sodium, but not necessarily sodium CHLORIDE....and I should try to get some seaweed into my face [xx(]. I managed to gag down some Kelp with Cayenne seasoning and I swear in about 3 days the Tortilla Jones was GONE. Really amazing.
I think especially with both minerals and stress, it all comes down to what the individual can absorb and use (minerals) and how any given individual processes 'stress' and just what 'stress' is to them.
Now that we know more about your daughter, I'd be leaning on the Oatstraw for both the gentle minerals AND the nerve-strengthening qualities. But more than anything else, I'd be really inclined to teach her to [url="http://www.ladybarbara.net/Self-testing.htm"]Self-test[/url] as, for WHATEVER reason, her little body may process things very differently than other folks and what, in theory, should be GOOD for her simply ISN'T. It could be VERY enlightening and quite empowering for her. Worth a try, can't hurt.
(you should see the consistent NEGATIVE I get to corn in ANY form!)