This character is the girlfriend of Creighton Duke and a victim of Jason Voorhees. This death is the only death caused by Jason that is completely off-screen (there were other off-screen deaths but this one is 100% off-screen). In the final version of the movie Creighton says to Jason "son of a bitch remember me" so they met before.
Since it is safe to assume that her murder occurred before the events of the film, but after Friday the 13th Part VIII: Jason Takes Manhattan, she can be counted as his 87th victim.