Another to consider is Alaska

They have a good range on partners:- Alaska Airlines, Air France, American Airlines, Big Sky Airlines, British Airways, Cathay Pacific, Continental Airlines, Delta Air Lines, Era Aviation, Hawaiian Airlines, Horizon Air, KLM, LAN Chile, Northwest Airlines, PenAir and Qantas.

As she won't get status, and the benefits that go with status, earn to burn ratio plus any $ needed for rewards & keeping the ff account alive will determine the best ffp. When purchasing for such a trip we FT'ers will consider the flight cost & the ff program potenial. A RTW trip as your post is best in one alliance (either Star RTW or a Oneworld *ONE4) to maximise miles-points