I mean, if she will or does. I suggest her to sing in English. I mean, her voice is well, deep and it's quite unique and distinguishable from the other members. Making her also easily recognized by the public. Also, her dancing skills are on the top. So great she could be as great as Shakira or Beyonce in both singing and dancing. Also, I imagine her being on TIME magazine or Cosmopolitan or any other worldwide magazine for powerful individuals because I see the potential in her to be known all around the world. 

Also, Stephanie has a powerful voice that makes everyone listen. Not only that, she can be popular as a ballerina alone. Also, she can stand alone with her skills and also her language skills. Her English dosen't sound akward and in my point she can be a very popular and even a legendary solo artist if her songs are kind of the same style as Beyonce because both of them have deep voices.