I know :/ thankyou :) weird question, why is your name chevaux?! Just wondering as my horse is called Chev! :L
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I'd guess, she might be from France. Cheval/Chevaux - horse/horses in French. Being from England, I'm surprised you didn't have to learn French in school. I know I did. By the way, I was born in Devon. Have tons of rellies there and in Cornwall.
So, if not already done, I'd take all the horses out of that field asap or at least remove all the grass that was given. By your post, I was not quite sure if the horses had been in that field for a long time with no problems or if it only started when a pile of grass of some kind, was given them.
The filly, sounds as though she had some kind of poisoning. I know chicken feeds contain something which will damage horses. Can't right now, remember just what it is. Maybe chicken feed was mixed in with the grass or on that field?
Certain types of grasses, can also be poisonous/damaging to horses.
Forgot to add. Do you know about grass sickness? Not unusual in the UK. Needs to be diagnosed asap. A friend of mine has one with the problem, in England. Make sure your vet considers this. It is a deadly problem.