Girlfriend was her last big massive monster hit, but since then she had decent hits like When You're Gone or What the Hell and excellent singles like Smile, Hot or Rock N Roll.
When You're Gone was as big as Girlfriend in Europe and WW. What The Hell sold near to 5 million copies WW, and HTNGU had some moderate success WW also.
Probably her last #1 hit but hardly her last hit. If she releases a new album she might get another top 20 hit. I don't see her ever getting a top 10 hit again sadly. She hardly sells albums anymore too. She needs to change her formula and most importantly her label.
Yes unless the good sis gets her **** together. Ain't no teenagers wanna be Rock N' Roll. She needs to appeal to the masses. Or at least drop Epic Records.