Sheila Birling's one of the few characters in An Inspector Calls that undergoes any kind of significant change. At first, she's what Priestley describes as "a pretty girl in her early twenties, very pleased with life and rather excited." A spoiled, entitled rich kid, Sheila initially gives the impression of someone who's never once thought about the reality of life for those less fortunate than herself.
And yet it's soon established that there's something about Sheila that sets her apart from the other members of her family. It's noticeable, for instance, that she's the only one who reacts to news of Eva Smith's death:
Oh, how horrible! Was it an accident?
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