I've got no axe to grind about this. I was never really keen on her voice, but I didn't mind her hit singles. As for her doing a cover version of this song, I don't see what peoples problem with it is.
I remember when Lulu covered Bowies The Man Who Sold The World and my mate who was a massive Bowie fan really spat his dummy out and proclaimed that Bowie would hate it and probably try to get the song banned. I said I doubted he would do that seeing as he produced the song and also played saxophone on it.
Another mate of mine was ascathing about Rolf Harris recording Stairway To Heaven, so I asked him if he knew why Rolf had recorded it? He said no, so I explained that he had appeared on a TV show in Australia and they always asked their guests to sing that song, so Rolf did, and a lot of people loved it, so he recorded it and donated all the proceeds to charity, but it wasn't his idea to record it in the first place.
At the end of the day, if you like a song by a certain artist then listen to it, but if you don't, you know where the off button is.
Life isn't a dress rehearsal.