The classic trip to Kenya is a week on safari and then a week at the coast (or less days for both).
There are lots of UK-based travel agents who will be more than happy to book that for your UK colleague. Most will recommend flying between places as that is quicker and easier, but, inevitably, is more expensive. Lots of luxury tented camps and lodges in parks and reserves. The Maasai Mara is the top safari destination.
Something like this:
Fly Nairobi to the Mara
Fly Mara to the coast (Watamu or Diani recommended)
or
Fly Nairobi to the Laikipia (near Mt Kenya) and stay on a private game conservancy
Fly Nanyuki to the Mara
Fly Mara to the coast.
It will cost her, though! Kenya is not cheap.
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