I think it probably won't matter because the amount of time Fleetwood Mac spend working on albums before releasing them is biblical, and Stevie will have all the time to finish her little tour and make a second Songs From The Vaults, if she mantains the same timing and process schedule of the first, before contributing something to the album at the last minute.
This is particularly true since this could be the last album of the band and they will want to produce and polish the **** out of it. You also have to think that she isn't a musician for the band, so a late contribution won't slow much the process.
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