Who cares if she's not smart? If being a singer/entertainer is her calling then why should anyone expect her to be a rocket scientist? I've seen the clip and she does seem quite dim, but if her music is good then none of that matters.
I've never even heard her music, but it sounds like she's had a very troubled life, so if things are beginning to look up for her then more power to her. If her music is pleasing to others, she's touching peoples' lives and she's finding happiness then that's great.