Hi Verbena, your post is interesting. So I thought, if you were at some of the most prestigious schools, where they would really guide your DD, what would they be advising? So, I looked up NCLS, JAGS, CLSG, SPGS, and HBS to see what their GCSE advice/rules were. I couldn't find any info from NCLS and JAGS, but I did find a common trend in the other three, which may or may not be helpful to your DD (I assume working in zoos is pretty sought after, so the courses will be competitive.)
CLSG:
Girls encouraged to take 10 GCSEs
Must take: English, English Literature, Maths, Chemistry, Biology, Physics, one MFL and one Humanities subject.
SPGS:
Girls encouraged to take 11 GCSEs
Must take: English, English Literature, Maths, Chemistry, Biology, Physics, one MFL.
HBS:
Girls encouraged to take 11 GCSEs
Must take: English, English Literature, Maths, Biology, Chemistry, Physics, one MFL, either Geography or History, and one creative subject (Drama, Music, Art or Design and Technology).
I presume these schools have sussed out how to keep children's options open. That means maths, english, triple, science, a MFL, a humanities subject and a social science subject. Is she willing to do that? I think it sounds like a lot of work, but probably worth it if she is motivated and capable.