I'll go the other way to the majority here..
Right now she has the opportunity to study something and spend time involved with something that yeah, may not be the career she settles on for the rest of her life, but shes passionate about it now and it will give her some transferable skills.
It's unlikely to be an opportunity that comes around again - how many of us would LOVE to do some of the fascinating and amazing courses available now, but we have to earn money, we have dependents, we don't have the time.
University is not just about coming out employable and getting a job - going to university, sticking to your studies, learning who you are and how to manage your life is also a huge huge part of it.
I did a similar sort of thing (college not uni though), instead of A levels I did a National Diploma in equine studies - basically playing with horses, riding horses, learning how to manage land.... it was huge huge fun, I lived away from home, I learned a TON about myself and how to manage life...
Ultimately I learned that working with horses was not for me, but thats ok, better to learn that at 16/17 than to spend the last 20 years regretting not trying it out when I had the opportunity to do so.
So maybe this will be a stepping stone to other related work, or maybe she gets it out of her system and realises its not for her or, that she'd rather be involved in a different way.
Thats what this time of life is FOR, an opportunity to test things out whilst there is still a bit of a safety net.
Let her make her own decisions, I always think better regret the things you did.. than the things you didn't.