It seems kind of difficult because the Kelly Clarkson brand is so hot right now that her overall popularity is unaffected by her music career, seemingly. In an ideal world, her favorable public image would reflect in her album sales, but there are now other mediums through which people can support her. It sounds corny, but she's gone from American Idol to America's Sweetheart.
It's nice to see, in hindsight, that she's happy enough in her life to be this famous now. Her gripe with her manager during the Breakaway era was that he wanted her to be the most famous popstar in the world and that wasn't what she wanted- but look at her now: hosting awards show, judging a TV contest, touring, lead voice in an animated feature, upcoming talk show, book series, YouTube series...