She has improved, she's not on an average level, when she starts singing all of her songs nicely REGULARLY and not just in those boring 5 videos you show every time this question is brought she can be considered above average.
When compared to Beyonce, P!nk, Christina, Bruno, Kelly she is literally nothing. She can't play with her voice, she can barely sing the song as it is, that is if she doesn't speak the hardest parts like she's known for lol