I think it's fantastic that you're daughter is taking a keen interest in her future career at this early age, you should be very proud :o)
However, I do think that specialising in something so specific, early on, could be a problem. Doing A Levels in Biology, Chemisty and Psychology would be a great intro into the basic areas of a job in Forensic Anthropology, but I think that doing a degree in this specific subject could be a mistake. Googling the subject is all well and good, but to spend 3 years studying for a fairly specialised topic, then be unable to get a job could really ruin her confidence.
My advice would be to do A Levels relevant to that eventual career, then do a more general degree, how about a joint honours in Biology and Psychology? That way, if she gets halfway through and decides she doesn't want to be a Forensic Anthropologist, she has other options. Then if she does decide she still wants to work in that area, she can do a 1yr masters course, or a longer PhD course. It's just not wise to narrow down your options at such an early stage!
I think, what the teacher meant, is that the profession isn't well known, and so as a result it's very hard to get into, that maybe your daughter should widen her choices.
I don't mean this as a bad thing! I have a degree in Psychology and to get a job in the area is near on impossible. From a group of about 30 or so friends, NONE of mine have managed to get a job as an assistant psychologist! It's so competitive. As for the rest of my friends, many have had enough of psychology, after studying it in such detail for so long! However, with a psychology degree there are so many other options (Teaching/Nursing/Police/HR/So Many More!) that by doing a more generic degree, we haven't shut down career options, yet we can still do what we dreamt of when we started the degree!
I wish your daughter all the luck, I hope whatever she