Right at the moment you saw that potential music skill in your child, don’t hesitate to support her interest. Not all children have the talent and you should be proud to have one. Buy her that toy piano or guitar when the age is right, admit her in music school and appreciate whatever piece she is able to play or learn. You can look over Takelessons.com for ideas and examples.
Be there all the time as this could boost her confidence and self esteem thus inspiring her more. However, do not ever force your child to play instruments that are not her choice, let her explore the musical world and discover within herself the beauty of being able to learn how to play.