I would call her an "outcast" per se, but I don't think she was ever shoved down the throats of the public like Britney, Beyonce, Gaga, Rihanna, etc. She kept a low profile but still kicked ass and she still is.
Also, she not doing less than stellar. Her songs are reasonable hits. Hell, she still sells more than Rihanna. Fine she's past her peak in hte U.S., but that's ok. She is still making herself viable here.