Strangely, mine has only just started eating hay this past week! She only eats hay when she doesn't get enough grass, so the good grass must have been eaten...
Is the diarrhoea projectile and (very) smelly? Mine had this a year ago, it turned out to be an infection. Cleared up very quickly with antibiotics from the vet. She had similar timing to yours, was taken ill on Friday evening so I had 2 weekend vet call outs!
Is there an update on the rider that fell in the puissance? He looked pretty dazed when he got up and the horse clipped him in at least one place with a hoof.
I've never understood why commentators always talk about it being the spectacle everyone wants to see. I'd much rather see them go round a course of jumps rather than one single one, I find it more interesting.