It's probably just easier to keep everyone else the same and for Stevie to alter her vocal part, than it is for Stevie's vocal part to stay the same and everyone else have to change. If she were taking stuff up, the guitarists/bassists could just capo, and that'd be easy peasy. But unless they're already capo'd at a higher fret somewhere, taking it down would require them to either down tune their instruments or re-learn it in a different key. Which isn't impossible, obviously, but I can see why there'd be a hesitation to do that.
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