One of the most common complaints about the film is how Brenda is able to pull off many of the kills and traps that she does, including rigging a body in a tree and taking down victims much larger than she is, despite having the skinny build of Rebecca Gayheart. The ending reveals that the entire movie is being told between people as something that happened to "a friend of a friend" who went to the school... in other words, an urban legend. And like any urban legend, details are likely to have been altered in the retelling, exaggerating the killer's prowess and the brutality of the kills, if it even happened in the first place.
The sequel mentions that eight college students were killed during the events of the movie. We only see the deaths of six. This, combined with Brenda's line at the film's conclusion that the end of the story was not told correctly, heavily implies that she actually succeeded in killing Natalie and Paul.