Fans were disappointed to see the unreleased song would not be included on Zach's eagerly awaited record.
The 2024 instalment is set to take place on August 16-18.
She'll be joined on the guestlist by The War and Treaty, Sierra Ferrell and The Lumineers.
The self-titled project is due to be released on Friday, August 25.
The hit songsmith was surprised with the news by Bill Anderson during her show at Nashville's Ryman Auditorium.
The song will feature on the Big Loud prodigy's debut full-length album, which will be released in September 2023.
