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May Allah Ta'ala bring ease to you an your entire family (Ameen).
This is only applicable if you are:
if not applicable, please ignore.
You cannot barge into a new family and start to suggest changes without having rock solid relationships with all concerned. If the mother does not se anything wrong with the situation then your intervention will damage your relationship.
Build a relationship with the mother and make her see your concerns.
Build a relationship with the whole family and make them all see your concerns.
Without above, you are just meddling into the lives of others and it is likely to backfire and damage your relationship
Depending on the past family life, the girl may have mental Health issues and not Jinn or black Magic. Young girls self-harm themselves many times and it has little to do with Jinn or Magic.
All of our Duas are with you. Truly terrible situation and as fathers of young daughters many of us understand your pain but don't react without considering all possibilities.
May Allah Ta'ala bring ease and comfort to you and your entire family (Ameen).
This cannot be undone and I am sure it will be greatly appreciated.