According to at least two members of the group, that most likely will never happen.
"She ended up getting a divorce, she ended up selling her house in L.A., she moved back to England, she quit the band, she sold her publishing,” Buckingham said. “She didn’t necessarily have to burn as many bridges as she did. Everyone sometimes wonders whether or not there might have been more of a middle ground for her to strike, not necessarily in terms of her staying in Fleetwood Mac. But she just wanted to reinvent herself. She seems to want to lead the antithesis of the life she led before, and I don’t pretend to understand such a radical change but it was obviously something she needed."
Stevie Nicks told Rolling Stone "She is done. You know when you look in somebody’s face and you can just tell? She doesn’t want to do it any more. She doesn’t want to fly. She doesn’t want to come back to America. When she left, she left."