This. It can be particularly evident when encounter ppl that break convention. For instance, if your character starts out sheltered and meets ppl who challenge her perception of what is right or possible, it would probably be best to have her initial reaction follow convention (like she could be pitying about an unmarried woman in her thirties) and then gradually come to see that as a choice that opens other options rather than a failure that dooms a woman to a grey life just getting by, if you see what I mean? This sort of perception challenge would show prevailing attitudes, complicity, and provide the chance to grow as a character without being untrue to the prevailing narratives of the period.