Could you please explain to me if the second she in this sentence sounds natural or redundant and the reason behind your answer:
- She gets a sparkle in her eyes when she looks at you.
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In a when clause, a finite verb—one which is inflected for tense, person and number—requires an explicit subject, so the second she is necessary.
It is only if you use a non-finite verb (in this case an -ing form would be acceptable) that you may omit the subject; the subject is inferred to be the subject of the main clause to which the when clause is attached.
She gets a sparkle in her eyes when looking at you.