I can't tell if it was her hubris or her arrogance that brought her to where we are now.
I feel like her parents should've given her a lesson in humility before this all came about. Just tell her that she shouldn't let the praise and accomplishments go to her head for the world is vast and there will always be someone out there who is better than she is at violin. In this case, Kyou, though Kyou's want to do guitar instead of violin probably rubbed more salt than needed into Shiho. Poor lass just wanted to be friends again but we all know what happened.