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She was a girl with deep-set features.
Literal
She [topic-は] carved-deep facial-features [possessive-の] girl was.
彫りの深い顔立ち ('deep-carved facial features') describes a face with pronounced features — high nose bridge, deep-set eyes, strong bone structure. This phrase is often used to describe faces that look Western or mixed-heritage, as opposed to the flatter facial structure typical in East Asia. 彫り from 彫る ('to carve') metaphorically describes sculptural depth in the face.