Entrance

Entrance is a 2011 American psychological horror-thriller film directed by Dallas Hallam and Patrick Horvath and was written by Hallam, Horvath, Karen Gorham, and Michelle Margolis. Suziey Block stars as a barista who lives a repetitive and anxious life in Los Angeles. When her beloved dog disappears, she decides to give up and move back home, but first she invites all her friends to a going-away party.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.