Yeah don't give her details. Perhaps just explain that although you self-harmed its not a good thing to do and you don't do it. Perhaps place more emphasis on the fact that you are free and no longer do it, rather than the injuries themselves.
Otherwise, if I were in your position, I'd say something like "I was in an accident" or "its a long story, perhaps when you're older" but you say she's mature for her age so I guess just take it really slowly and gloss over the details.
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