Mack was scheduled for a bail hearing Monday, but it was delayed.
Her lawyers did not respond to a request for comment, and federal prosecutors in Brooklyn declined to comment.
It was also revealed Monday that Mack allegedly tried to leverage her celebrity to reel in big fish on Twitter — including Harry Potter star Emma Watson and singer Kelly Clarkson.
".@EmWatson I participate in a unique human development & women's movement I'd love to tell you about. As a fellow actress I can relate so ..." Mack tweeted at Watson in January 2016.
"@kelly_clarkson I heard through the grapevine that you're a fan of Smallville. I'm a fan of yours as well! I'd love to chat sometime," she wrote to the pop superstar in 2013.
Meanwhile, Sen. Kirsten Gillibrand's Republican challenger, Chele Farley, claimed on Monday that Sen. Gillibrand's stepmother, Gwenn Belcourt, was aggressively courted by the alleged cult.
Sen. Gillibrand's campaign did not immediately respond to a request for comment, but she has claimed that she was unaware of Nxivm, even though she grew up in the Albany area, where the group operates, and her father, Doug Rutnik, worked as a lobbyist for Nxivm for four months in 2004.