Aubrie Sellers had plans to go line dancing at the Borderline Bar & Grill in Thousand Oaks, Calif., on Wednesday night (Nov. 7), but made a last-minute decision to stay home.

The country singer tweeted about it on Thursday morning (Nov. 8), saying, "An hour before we were to leave, I got home and Laney’s eye was swollen shut so we didn’t go. Thinking of everyone affected by this today. Truly unbelievable."

The shooting began less than two hours after Sellers said she planned to arrive, meaning she would have almost surely have been there when the gunman set off a smoke device and began firing. There were 12 victims, including a police officer.

The gunman, now identified as 28-year-old Ian David Long, also died at the scene. Authorities believe he took his own life.

Laney is Sellers' cat.

"My heart goes out to everyone affected by what happened last night," the singer tells Taste of Country. "It's important to realize how anyone in this country could be in this position at any moment and to keep empathy in our hearts and minds when trying to figure out how to best prevent this from happening in the future."

Other artists have also responded with memories of playing Borderline. Meg Linsey, formerly of Steel Magnolia, is among them, and on Thursday she tweeted: "My thoughts and heartfelt prayers go out to the victims, their families and the Borderline staff."

According to the venue's Facebook page, Jerrod Niemann played the bar last month. Colt Ford is another artist who's played the venue in the last two years.

Sellers is signed to Warner Music Nashville. The 2017 Taste of Country RISER released a song called "Liar Liar" to radio last year. She's also Lee Ann Womack's daughter.

Watch Aubrie Sellers Sing "Liar Liar"

Country Stars React to the Mass Shooting in California