I got red food coloring on my fingers in the third grade and it took two or three weeks to wear out. I would say give her hair a gentle wash to get any immediate residue off, and then just wait it out. It'll look silly, but if you put a hat on her, people will be none the wiser. The only other thing you might try is washing with baking soda, but it is incredibly drying, so it's probably better just to wait it out. Anything else you could use to get color out would be potentially irritating on young skin.
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