I really like it. Stevie was obviously sought out to do this song for the show. Perhaps, like Silver Springs, there is a chance she couldn't just offer the song to someone to use, so she put together a piece they could use. I don't see this as a slight to anyone, and probably more of a business decision. Recording this song without Fleetwood Mac probably gives her the right to use this version of her own song without having to seek permission from Fleetwood Mac.
And it is sort of a dirge sound. Maybe that's the point of it.