Right now they offer a triple points promo on meetings-events, but I don't know whether it is targeted to Preferred members or not!!
50K if you split it to 3 events and use the promo will yield about 450K plus 250K points if you pay with the MR Visa!! Additionally you will get 30 eligible nights towards status!!
700K points would worth around $7000 valued VERY conservatively at 1c/point!!
Wish the best for your daughter!!