I think Stevie sounded pretty good. Unlike many she does not use pre-recorded vocal tracks. Her voice is not like it used to be but its fine.
Now you want to hear bad singing? When I saw this last year, I thought it was a parody. Has anyone heard Vince Neil sing lately? He is so fat busting through his shirt and the words he sings sound like a completely different set of words. You have to see this to believe it. Just imagine if Vince was a woman who put on this weight and sounded so bad what people would say? This is ridiculous and everyone needs to see this
And no doubt the back up vocals are pre-recorded. In all fairness, Vince has a tremendous amount of energy for being in his third trimester.
https://www.youtube.com/watch?v=RTJ8OWcFmCk