So, as a singer...
She can hold a tune but she has a lot of bad habits from (I assume) never having proper training and finding her voice at a time when everything was very pop-sounding and riffy e.g. Britney, Christina Aguilera, Mariah Carey, so she has emulated that sound. She always sings with the same vocal placement, very forward in the face and ‘twangy’ and she’s said herself she only knows how to sing loudly. Her tuning isn’t great, there was a video a while back of her singing Hopelessly Devoted To You acapella and she keeps going flat, then when she gets to the big ‘BUT NOW... there’s nowhere to hide’ it’s a proper bum note to the point where she changes key