That's just a nervous habit, kinda like biting the fingernails. Try pulling her hair back more and buy her pretty barretts to put in her hair. Remind her that her hair is dirty (yucky) and she really doesn't want to put it in her mouth. Tell her that you will get her pretty barretts to put in her hair if she can keep her hair out of her mouth. If that doesn't work, then you may have to cut her hair short enough that she can't put it in her mouth.
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