<p>My daughter started weekly hour voice lessons at 9 and I saw huge growth changes in her voice at 12, 16 and now currently at 18. Day to day your daughter’s voice will have changes where higher notes will be harder to hit somedays more than others - it’s related to her cycle, the weather, fatigue, stress, etc. She is growing and her technique is building - she will sound worse when learning something new until her body gets comfortable with it. Once she is checked out by an ENT and her asthma meds are regulated (the main culprit I bet!) I wouldn’t worry in the least. Tell her to relax and especially NOT to push! At 12 somedays my D’s teacher would say she sounded very mezzo-y and some days she sound very soprano-y. You have no control over her fach in the end.</p>
<p>By the way, it is a fallacy to think that sopranos always sing higher notes than mezzo-sopranos. Many mezzo’s can sing higher than sopranos - but they can’t sustain singing in that tessitura and it is not comfortable or their loveliest register. M daughter can hit a F above high C but there is no way she can sustain singing up there (and trust me - no one would want to hear it either, lol)!</p>