The 'Appaloosa' novel usually centers around the Western experience. It can be a tale of a drifter who comes across an Appaloosa horse and how that encounter changes his life. There could be descriptions of the beautiful yet unforgiving Western landscapes. It might also touch on the cultural aspects of the time, such as the code of honor among cowboys, and the role of horses in their daily lives. The story could be filled with action, from horse races to gunfights, all set against the backdrop of the Western frontier.
Typically, in the 'Appaloosa' novel, you might find a tough cowboy as one of the main characters. He could be a loner type who has a special connection with an Appaloosa horse. There may also be a female character, perhaps a saloon owner or a rancher's daughter, who adds a different dimension to the story. And there could be the villain, like an outlaw or a corrupt landowner who causes trouble for the main characters.
Perhaps there's a best friend character. This person could be a mortal who is initially unaware of Nancy's demigod status. As the story progresses, they might get dragged into Nancy's world and have to deal with the consequences. There could also be a villainous demigod who is trying to stop Nancy from achieving her goals or is causing trouble in the demigod world in general.
Yes, Nancy Drew can be considered realistic fiction as it often involves situations and characters that could exist in real life, with some elements of mystery and adventure.
Nancy Mulligan has elements inspired by real life, but it's not a completely factual account. Songwriters often blend reality with imagination to create a compelling narrative.