Sadie quickly became an audience favorite, and appears to be the story's most popular character who wasn't a major character in the canonical first season.
The sheer amount of the He's Just Hiding reaction pertaining to a certain challenge victim makes it wholly apparent how much the reader base enjoyed their brief presence.
He's Just Hiding: This was a widespread reader reaction to a certain contestant being apparently killed in a challenge accident. Not surprising, considering that there was no visible blood and the victim's body was not recovered.
Pandering to the Base: The author has acknowledged that Sadie has gotten several additional scenes because reader response to her portrayal was so overwhelmingly positive, and that the Lindsay/Justin ("Lustin") pairing has also gotten some additional play due to favorable reader response.