She is the 59th victim of Jason Voorhees.
Girlfriend to Russell, Sandra's most likely only with him for his money, but loved making love with him. During the party, she tries to keep David from destroying stuff in Russell's uncle's cabin. And trying to cheer Russell up since he was upset about the mess that everyone was making there. Sandra was the only other girl at the party besides Madison Paulson who went out of their way to be nice to Tina Shepard, as seen when she kindly smiles and yells hi to her when she first arrives at the house the one morning, and her smiling and yelling hi again when Nick introduces Tina to her, Robin Peterson, and Maddy. She also acted like she thought Melissa Paur was being mean when she said "Nice outfit. Looks like her mom dressed her." And Sandra saying "Melissa!" in a scolding manner like she thought that was being mean. When Melissa along with a duped Eddie made fun of Tina the morning before everyone (Sandra included) was killed she looked slack jawed at Melissa like she was shocked that she could be so mean to Tina with Melissa making fun of her being a former mental patient. She also seemed to be one of the few people concerned about Kate Pataki and Ben MacNeal's relationship issues alongside Russell. Later that night, Sandra goes out for a walk early in the night with her boyfriend Russell and she goes swimming in the lake. She tries to entice him into joining her, but he refuses so she strips down to her red one-piece swimsuit to get into the water, dives underwater and then starts to swim. She continues to try to entice Russell by talking crazy to him and saying, "You need a formal invitation?! Russell, party for two! Right this way, please!" She then goes underwater.
While she goes underwater, Jason Voorhees appears and kills Russell by axing him in the face, then when she bobs back to the surface of the lake she sees his dead body and starts to scream. This makes Jason start to chase her by going into the water. Scared and not knowing what to do, she starts splashing and treading water and continuing to scream non stop. Jason then appears from below her and grabs her from one foot to drown her in Crystal Lake.