<p>Listen to the speaking voice of an adolescent vs a high school girl vs a collegiate and you will hear that the pitch of the speaking voice does raise slightly. </p>
<p>The issue of your daughter not being able to sing notes she could sing six weeks ago is an entirely different issue, and it needs to be checked by a physician and then very good voice teacher. It sounds like she is hoarse, with the airiness, the cords are swollen and/or irritated. She should stop singing until she is checked. Good luck.</p>