Our expert says:
Why not take her to see a child psychologist ( the school may be able to reccomend a good one ) for assessment and advice on how to introduce better discipline and helping her to learn that none of us get everything we want. 15 months is rather young for this sort of problem to arise. And the head-banging and self-injury is not something one can ignore. Her slapping you is odd, too ; and for a tantrum to last 30 minutes when you restrain her, is also more than one would expect.
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