Meghan sold over 20 million singles WW this year, 1.8 million albums, Scored another top 5 hit with "Lips" that was HUGE, Scored another top 20 hit with "Dear Future Husband" and other top 30 hit with "Marvin Gaye" that became her biggest hit in Italy , France and UK since "Bass" And she's currently in the Top 10 on iTunes with her latest (4th) single that has already reached platinum status in the US and triple platinum status in Australia and New Zealand.
And I didn't mention the fact that her album could have been the first album that was released in 2015 to reach platinum status in the US (Sold 860,000 in the US currently) if Adele have released her album next year