With a story for young readers written in nineteenth-century England, would we really expect anything but a writing style that remembers to cross all its T's and dot all its I's? Certainly not, good chum! The writing style is utterly prim and proper no matter what is going on, kind of like how Sara remains honest and pure throughout all her trials. After all, this is how the story starts:
Once on a dark winter's day, when the yellow fog hung so thick and heavy in the streets of London that the lamps were lighted and the shop windows blazed with gas as they do at night, an odd-looking little girl sat in a cab with her father… (1.1)
Nothing unseemly here, folks.