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Hello and thank you for using JustAnswer. Your daughter could be exhibiting symptoms of Formication, which is basically a tactile hallucination where the individual feels like bugs are crawling under her skin or on the skin. May I ask, would you characterize your daughter is hurting herself by her scratching her whole body?
If she is hurting herself than you could call 911 or take her to the ER to get involuntarily committed for psychiatric reasons where they will treat her and make sure she is safe. Other than this though, every other treatment option has to be voluntary...just like if you had a heart problem, the choice to see a cardiologist is up to you alone, same applies here unless you push for an involuntary commitment.
Please let me know if you have any other questions or concerns as I would be happy to continue assisting you regarding this issue.