Threatening to cancel your music lessons and saying that she doesn't like you any more is very childish, but you on the other hand seem very mature about it - parents are only human, give her time. Hopefully she'll realize that you haven't changed.
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition