I'm not sure about the other members of Fleetwood Mac but in April 1980 Stevie did not lay around for a month resting. Instead she hung out with Tom Petty and The Heartbreakers in a recording studio. I present you now with some of those results:
Gypsy--4-3-80--take #6--Good Vocals
Outside The Rain--4-4-80--session #2--New lyrics in latter half of song to enjoy--
Sanctuary--4-4-80--the signature Tom Petty and the Heartbreakers sound--nice vocals near the end when she sings
Just How Far several times--
Starshine Silver--4-4-80--session #2--At the end Stevie is excited when she sees Debbie dancing--Stevie is whispering to someone at the end; in one of those hushed tones she says,"you're not daddy."--
Since I like pretending this thread is in real time just try to imagine if this really was April 13, 1980. Then these songs were recorded about two weeks ago! Imagine(I know you can).