I don't know David, from what Lindsey said, she's not on the album:
Guitar World, June 2003
"Stevie sees herself as being defined within a certain set of boundaries, outside of which things probably don't ring true to her, or to the people who listen to what she does," Buckingham theorizes. "But at the same time, I think she's intrigued by the idea of pushing the envelope, especially on this album. She never wants to go too far with it, though. For example, I asked her to sing on the song 'Come' and she wouldn't. I think she thought it was dirty. That tells you something about someone who has been a rock icon but in some ways is still quite a conservative person. And I don't see her as someone who has lived her life very conservatively. So there's an interesting dichotomy there."
http://bla.fleetwoodmac.net/index.ph..._v2&id=169&c=9