Well the worldwide tour that made her the biggest earner in 2011 showed the dedicated masses around the world, and I can confirm that not only was the show great, her fans are loud and many also in this non-English-as-first-language country. Not so much single top 3s, though, but album-wise yes.
Britney was last year's highest earner(female musician i mean) and #4. Idk what you mean. Or you mean tour gross?
I know T-Swift is huge in the Netherlends tho