I don't even know how she is....
But I guess from this post she is a member of the groups with the impossiblen name of... wait I most Google it... Le sserafim? Yeah I guess that is the name.
Lesserafim is a big group, but they would be no where near as successful in Japan without Sakura. She is the most popular idol in Japan, definitely as big or bigger than twice as a whole. She could sell 100k alone in Japan