Christine wants to rejoin the band according to The Guardian

[jbrownsjr]

Originally Posted by Phil

Whilst I'd prefer all new material for an upcoming Mac album, if three of the EP tracks were revisited with contributions from Christine, I wouldn't object. Sad Angel is fine as it is, but Christne's piano and backing vocals wouldn't go astray. Miss Fantasy could definitely benefit from being beefed up a bit - it's kind of insipid and aimless in it's present state. It Takes Time is gorgeous already, but a delicate harmony vocal from Stevie could be wonderful.
Without You just needs to be buried at this stage.

Maybe she could re-do the piano for, "It Takes Time". It has almost zero character as is, very generic.