Almost every single album she has every released has been platinum, including her Christmas one and "Breakaway" which was 6x platinum. She also has ten Top 10 singles and three Grammy's. I'm sorry, was that a question?
Wait... if having a #1 hit after a flop era (which still had a platinum album) and then having another #1, and a massive radio hit (Catch My Breath) and another platinum album doesn't make you a relevant artist then I don't know.