Had a quick look. When the mountains are mentioned she is in Nairobi and there is a brief cut to a view across some tarmac towards a range of rugged hills. Certainly not Wilson with the Ngongs behind. I think the reference might be to crossing higher hills to the west of the Rift Valley - the commentary mentions her flying higher than she has before, given Nairobi is around 5000' ASL, it wouldn't take much for her to need to climb to 10000 or so.