She needs to be aware of how stressful the job can be - almost HALF of newly qualified vets leave the profession in the first 5 years due to stress and work/life balance. Older vets are retiring in droves and usually selling their practices to the large corporates.
A lot of work is dealing with man-made problems ie the designer dog breeds with genetic problems; embryo calf transfers into surrogate cows that are too small meaning C-sections; the huge rise in obesity in many pet animals; some less than savoury treatment of farm animals (not all of course but they do exist).
Also the daily problem of clients not being able to pay or being slow to pay, complaining about treatment etc. A lot of pressure on vets is dealing with the public, the animals are the easy ones.
Be aware that there is only a couple of vet schools which will take a B in chemistry, the others all need a non-negotiable A.
Dont forget the 2 Scottish vet schools - very highly thought of and usually top/near top of rankings (but even more competitive to get in , historically 10/12 applicants per place).
When she gets to applying , there are specialist mentor companies that will coach her on interview techniques and advise in how to make her personal statement - expensive (and personally I don’t agree with them but they are available, often the same ones that advise on getting into medicine and dentistry).
it’s definitely a vocational job and “loving animals” is not enough, she will need to be able to discuss the downsides of being a vet at interviews etc. and demonstrate that she is going into the industry with her eyes wide open.