While there aren't a ton of slasher films that have a woman be the killer, there are a few that stand out and definitely stick with the audience.
The Netflix original movie has some thrills and chills and also has some laughs and a cast that is quite likable even if most of them are trying to kill everyone they run across. It stars the actress that is becoming a bit of a scream queen in Samara Weaving. It was enough of a surprise that "who was the killer in Friday the 13th" is still a trivia question that can trip up even the most devoted slasher horror fans. It turns out that Mandy is not quite the wholesome cheerleader she appears to be, and is instead a mass murderer. In fact, what Scream and Scream 2 did was basically what the Voorhees clan did in reverse. Jason didn't become the killer until Friday the 13th Part 2 thanks to the fact that it was his mom that started running through bodies like a hot knife through butter.