Under the Tonto Rim by Zane Grey

On Mertie Denmeade's birthday several of her girl schoolmates rode up from the school with her. They were to stay overnight and go back to school next morning. Lucy could not help wondering where they were going to sleep.

Among these girls was Sadie Purdue, whom Lucy observed with attention. Sadie possessed but little charm, so far as Lucy could see. Her face and figure were commonplace, not to be compared with Mertie's, and her complexion was pitted and coarse fibred, well suited to her bold eyes and smug expression. Her shoulders were plump, her hands large, her feet clumsy. Lucy could not but wonder what Edd Denmeade saw in this girl. She reflected then that it was absurd for her to have assumptions or opinions, until she knew more of these people. Every one of these Jacks had their Jills. It seemed inconceivable for Lucy to pass critical judgment on this Sadie Purdue and not include her companions. Lucy found them colourless, civil, hardy girls, somewhat like Allie Denmeade. She was gravely astonished to find that she had an inexplicable antagonism toward Sadie. For that reason she went out of her way to engage Sadie in conversation.