Ladyworld (2018)

Annalise Basso, Maya Hawke, Odessa Adlon, Ariela Barer

Eight teenage girls become trapped in an endless birthday party after a massive (imaginary?) earthquake. The girls' sanity and psyches dissolve as they run out of food and water. Eventually, they regress to their baser instincts, exploiting each other's fears and insecurities.