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Она́ что-то шепну́ла ему́ на у́хо.
Она́ is nominative, all good.
ему́ = dative , на = prepositional or accusative [my guess] у́хо = nominative or accusative [my guess]
It seems to me that его should be the correct inflection to use here because у́хо is ultimately the main declension его must follow.
Am I missing something?
Because на ухо is a set phrase. You cannot break it apart. Compare it with other set phrases dealing with body parts:
под руку (сказать)
в ногу (шагать)
ни в одном глазу
and so on.
Languages are different and use different grammatical structures. While English can't do without posessive pronouns and use them in abundance, Russian considers that it's better to show the recipient of an action using the pronoun in the dative. Thus we would avoid saying Она что‐то шепнула в его ухо or на его ухо. The best way is Она что‐то шепнула ему(the recipient ) на ухо.
