What at the opening to chapter 5 demonstrates Flora is no "farm gal"?

In the wee hours of morning, Flora wakes to hear Adam and another man named Reuben (her cousin) arguing outside her window. Flora opens the window and politely asks the men to quiet down, which they do with "flabbergasted silence." The men are flabbergasted because to them it is time to be up and about and so no one in her right mind would expect silence when it's time to be working.