im not saying your DD wants to be a vet but with the right GCSEs and excellent grades at BTEC it can quality them for vet med and other routes.
I looked into this for a student this year who'd previously been badly advised.
It is very, very difficult to get into vet med from a BTEC, and it would have to be via a gateway year (this generally requires you to qualify under widening participation criteria, some of which going to Hartpury would probably disqualify you from immediately).
You also need to take specific units within the BTEC, and it is the college who chooses the units, not the students- they may not be set up to offer the right units- and they will not change the units they offer for one student.
BTECs are great and a great route to uni in a lot of fields. In the arts, they're often a better option than A-levels. But if you want to go down the Med/Dentistry/Vet route, BTECs aren't the way to do it.
If she wants to do something more like Equine physio, or similar, then I'd strongly recommend Hartpury, and probably staying on to do one of their degrees- they have an amazing set up for this.
But for Vet Med, A-levels are really, still the way to go.