As a fellow animal lover, here is my feeble suggestion--I would skip the horseback riding as it will take a big chunk of your time for a rather limited expereince. Instead, I would allot much more time at the AK and SLOW DOWN. If you are going during the heat, I would plan at least 2 mornings there and allow her to linger and explore and spend ALL the time she wants at each exhibit; most exhibits will have a CM "in the know" right there that she can ask questions. Rafiki's Planet Watch is not to be missed! Plan it for later in the day when everyone needs an escape to the air conditioning.
Maybe let her pick out a couple of books on the animals of Africa BEFORE the trip? It would be neat to have the CMs sign by the animals they "tend" at each exhibit.
This is exactly what we are doing. We are planning two mornings (probably 9-1). Though, do not wait until later in the day for Planet watch - if you want to watch the live veterinary procedures, they are only done in the morning, so if you get there anytime much past 11 or so, you'll have missed them, is what I was told. I have Touring Plans for our two mornings, I'll share to give you an idea how we're splitting AK up:
Morning 1 (arrive at RD):
Tour Oasis Gardens
Meet Daisy Duck
Tour Pangani Forest Trail
Safari
Festival of Lion King (11:00 show), this will be a nice a/c break
Have a snack/lunch at Harambe Market, watch Tam Tam Drummers
Tour Maharajah Jungle Trail
Kali River Rapids
Morning 2 (arrive early for reservation):
Breakfast at Tusker House, 8:45
Conservation Station (Affection Section, watch any procedures, meet and greets etc... allowing 2 hours for this)
Safari
Tour Discovery Trail
Flights of Wonder - either the 11:45 or 1:45 show depending on when we get done the Conservation station. If we get done in time we'll do this first, then the Safari.
Then, any of the following are optional:
- Dinosaur or Tough to be a Bug
- Cretaceous Trail
- Triceratop Spin
- Boneyard Playground