if you look at her lips she's lip sync, not saying she didnt sing the song, just video dont match lips. on the other hand lips are awesome.
You are right on that. Often in music videos the scene location isn't going to have the tonal qualities for perfect recording. It's just picked for a visual backdrop.
Also the background singers (I suspect she sang those to and laid multiple tracks). And I hear but don't see a drummer (I suspect the musicians played those instruments and laid multiple tracks).
What I meant to say is that I originally thought it was a lip sync of the real Fleetwood Mac recording and then realized it wasn't.
After listening to it multiple times, I can hear a slight difference, but the difference is her voice is just better. She has much more precise control than the original. Which makes sense if you able to mimic someone else so perfectly. She sounds like what Stevie Nicks could have sounded like with more training.
I was listening to her No Doubt - Just a Girl cover and she did a good job on that one to, but what I noticed is that her voice was so clear and enunciated that I could clearly discern lyrics I had never clearly heard in the original. So so she sounds like Gwen Stefani, but a more precise and perfect version.
Or maybe my judgement is being....influenced.