You need to listen to her live performances.
Try this..of her singing a Billie Holiday classic:
https://www.youtube.com/watch?v=LPCizyBCTNs
Tried it, didn’t like it. Weak voice, can’t seem to hold a note. Too much “vocal stylization” for my taste.
Here’s the Billie Holliday version. I much prefer it. Did not have the advantages of modern recording technology. She has a smokey raspy voice of a singer in a cheesy nightclub, but she could hold her notes:
https://www.youtube.com/watch?v=-3jO-3BoGzM
Good Morning Heartache, Lisa Stansfield's version:
https://www.youtube.com/watch?v=LPCizyBCTNs
Billie's version:
https://www.youtube.com/watch?v=-3jO-3BoGzM
Ella's version:
https://www.youtube.com/watch?v=QAIoJPJ2elc
Stansfield can certainly sing, and I thank you for introducing me to her, but I like Ella's version best. As usual.