Questions & Answers about Sie wirkt ruhig, doch innerlich spürt sie die Enttäuschung über das Ergebnis.
wirkt comes from wirken and here means “to appear / to come across (as)”.
- Sie wirkt ruhig = She appears calm / She comes across as calm
- Sie ist ruhig = She is calm (states it as a fact)
- Sie scheint ruhig (zu sein) = She seems to be calm (more tentative, based on impressions)
wirken is often used for the impression someone or something makes on others, and it’s a bit more neutral and common in everyday speech than scheinen in this kind of sentence.