Howarth makes great instruments and I love their people, they are the nicest. Michael Britton is someone that I see regularly, as they come to NY often.
About the longevity of the instrument, I wrote that if they are played "daily", they will last 5 Years. But this only applies to an instrument being used and abused in a professional environment (much like cameras?) We have a ridiculous schedule where I work, me and my colleagues actually buy instruments on a yearly basis! . Plus this mostly applies to wood instruments. I can't tell if your daughter has a wood or plastic instrument. It all depends if she takes it seriously or not.
Interestingly, what makes an instrument being "worn out", is not what one would normally think. The mechanisms are actually very well made and today, pads and springs are of higher grade. The real problem is that, as the instrument gets played regularly and hard, the bore expands and contracts and the dimensions of the inside of the top joint are very small and are critical to both tuning and response of the instrument. Unlike a violin, you have a mixture of water and wood and is never a great thing. The top joins crack very often, although that is not a big deal, it can be repaired. The real problem arises when the dimensions inside the top join start to change form the contraction/expansion process, mixed with thousands of instances of the instrument being cleaned with a swab (some people use a feather for that reason). Of course, what I am describing, is akin to a "time lapse" film and this can be a very long process. but the result is that once the dimensions in that top joint have changed, the instrumen feels "blown out"
I appologize if this sounds like a lecture!
But you can see the parallels regarding durability.... my cameras look almost brand new. Yet, every time I see a photographer on the street with their Canikons, I can tell the equipment really get lots of abuse....