Was it wrong? Yes. But was it harmful? No. Kids of that age look up stuff much worse on the Internet. They've seen far more hardcore stuff than this at that age. It's just a fact of modern life. Do I think she should be charged with something? Yes. However, "Endangering a minor" is not at all correct. There was no danger, and there was no harm done. Maybe simply "Furnishing pornography to a minor".
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Heart of the guardian, way of the warden, path of the exile.