Hi. My undiagnosed daughter is starting to play the clarinet. She is having a very hard time making full, long sounds. She practically shakes as she tries to make sounds. I don't remember it being that hard to make sounds when I started playing it many years ago. She can only hold a note for a couple of seconds. She coughs a little while practicing too. So far, practice sessions only last 5 min or so b/c it's all new to her and getting used to it slowly. Think this is a normal challenge for all kids new to playing a wind instrument or think she's struggling b/c of lung function or something?