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She was a wonderful role model for us.
Literal
She [topic-は] us [for-にとって] wonderful role-model was.
にとって ('from the perspective of, for') frames who finds the predicate true — '[for us], she was a wonderful role model.' This perspective marker is essential for opinions or assessments that hold true relative to a particular viewpoint: 私にとっては難しい ('for me, [it]'s difficult'). お手本 ('role model, example') comes from 手本 ('model, copy [for practice]') — originally a writing model used to practice calligraphy — fronted with the polite お prefix. The image is of someone whose life or work serves as the template you'd study to learn from.