I hear her too. Its crazy but you are not alone.
Maybe its Lindsey disguising his voice as Stevie again
I have two possible theories for the phantom Stevie voice in a couple of places on the BuckVie album.
1. Lindsey deliberately altered vocals sung by himself or by Christine to sound "like Stevie." Why would he do such a thing? Maybe as a tribute to Stevie, maybe because he thought it sounded good, or more likely, just because he can.
2. We fans are so used to hearing the three voices together, our subconscious minds fill in the missing "Stevie vocal." I personally don't hear Stevie anywhere on the album, so my question to those of you who DO hear her is: do you think you hear Christine singing anywhere on 'Say You Will'?