1, there are many similar mezzo-sopranos. She debuted a little late, and there were not many catchy songs. There are also few songs that can be sung at a high degree. She doesn't have her own characteristics, and she usually keeps a low profile.
No one helped her package and promote it. In addition, the small number of songs is also a reason. If the number is small, it is difficult to pick out songs that are particularly excellent and easy to influence people. Without famous songs, it is difficult to be popular.