Her WW album sales:
Taylor Swift
5.8 million
Fearless
8.3 million
Speak Now
~5.3 million
Red
6 million
Christmas EP
1,004,000 (US sales only)
Speak Now World Tour: Live
346,000 (US sales only)
Beautiful Eyes (EP)
316,000 (US sales only)
+an extra 400k US sales that Nielsen Soundscan and Billboard include in her US total sales (If you add the US sales of the 6 releases mentioned above, you will find the total to be 22.4 million. However, Billboard reported this week that she's sold 22.8 million in the US, leaving 400k copies unspecified). They most probably come from minor live releases like Live in Soho, Journey to Fearless and stuff like that.
Total WW sales: 27,480,000+