With her Fröken Snusk ("Miss Smut", her previous persona) music, it's all highly processed vocals without much need for range. You can't really tell if somebody is a good vocalist or not.
But she was on Masked Singer Sweden, and did an incredible job singing Zara Larsson, Adele and Whitney Houston, really challenging stuff, and she showed off great dynamism, range and precision, whether in chest, head or mix.
She's having a really unlucky couple of months, that's what's going on, her instrument fighting other stuff when she needs it the most.