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Welcome to Flyertalk wanderlust852, if I may add to the welcome given by my colleague golfmad in the other thread.
I would have thought that the tight bit would be 747 upper deck (which I would certainly advocate you trying if you haven't done it before). I would have thought that she would have to be some way over a 40 inch waist to have a major problem there. Downstairs the curvature of the aircraft is a bit better than upper deck. 777 it's all the same really. I would just urge anyone carry a little bit of weight (to quote from Calvin) to get into the CW seat fairly slowly: the whole seating unit is linked together, so a heavy landing reverberates down several seats.