If her hair has length beyond the shoulder and is still curly, it likely wont matter a bit if you cut it. If only the back has curls, but the top is straight, they will either simply grow out or wont return if cut.
My oldest daughter had adorable curls in the back until her hair reached beyond her shoulders, then they disappeared. After we cut her hair (when she was 5) they did not return.
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Angel, et al
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Angel, et al
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