Stevie - Live Duets on Non Duet Songs
 

Stevie has sung many live duets throughout the years - with her band, Tom Petty, Don Henley - as on record, and with others as special guests / and at special shows (Sheryl Crow, Lady Antebellum, Taylor Swift, Dixie Chicks)

She has shared vocals on some non-duet recorded songs such as Rhiannon, Landslide, GDW, Edge of Seventeen.

I'm surprised she's never shared vocals on Dreams or Stand Back, two of her concert staples. Has she? I can't recall one performance ever with her sharing lead vocals on these two songs. Am I forgetting any?

Taylor Swift, Rhiannon at the Grammys

Dixie Chicks, landslide vh1divas live
I don't think she's ever done any one else

As far as I can remember, you are correct. I don't remember any duets on Dreams or Stand Back. However, in hind sight, I am sure Stevie wishes she had pulled out a Stand Back duet with Prince. That would have been EPIC!

Definitely. I'm sure she thought he'd always be around and it would happen eventually.

Not really a duet, but she played Dreams with another band than her own or Fleetwood Mac:

She recorded new vocals with Deep Dish.

When she was American Idol as a guest judge they showed a clip of her singing parts of Dreams with one of the female contestants.