Aww good luck to her, i would ask the school if they have a careers counsellor that could give you an idea of what would be the best subjects for her to take and what she needs to aim for once she's in uni etc.
For now though i'd suggest maybe even e-mailing the zoo, explaining as you have here that you have a daughter interested in their field and what their advice for her would be.
Could you organise for a birthday present or something a day at the zoo and do one of their overnight stays, meet the animals etc and talk to the handlers ??