An oral fixation or maybe
she is lacking in iron or another metal. Have you asked her what the taste like why she likes them and what happens if she doesn't have them? Might help in the search for an answer. Good luck, Becca
Please don't make the same question as multiple posts. You probably wouldn't get any more answers this way...below is the answer I posted to your first post..
Whenever children act out, it's almost always because they're looking for attention. The batteries get a "charge" out of you, so she continues to do it. You act like they could kill her..and she's trying again and again to get that attention. If I had to guess, I'd say that she's had a major life event lately..maybe a new child in the family, or a death of a family member?