Can you try giving her good size grit (manually popping into her beak) one piece a day for 3 or 4 days straight.?? The gizzard can't work properly without grit - and, as you saw, too much small grit can just get 'jammed up. Given what she pooped later - the fibrous grass - she may have instinctively know she needed grit to break it up - but a) took in too much small stuff (that got stuck as she was already backed up) and b) the fibrous grass was too far along at that point for the grit to help (was past her gizzard)We are of the same mind on this actually, thanks for spelling it out!
I think there is something not working right with her gizzard, there's too much undigested things in her poop that are tough, like corn, or hulled sunflower seeds, the day after she has that food, compared to everyone else. Mealworms seem better. So continuing this easy to digest baby bird food for now and waiting to see how it goes makes sense. She doesn't like crumbles mash made with water or yogurt (she does like yogurt). I haven't yet figured out a better way to get her to eat enough of the nutritious feed except by tube feeding.
I am thinking only one decent sized piece a day...but for a couple days...in case it isn't staying in her gizzard....but also so it isn't overloaded all at once with 'indigestible'
Anyone with more anatomy knowledge, can you answer this question:
Since a huge plug of matted, fibrous 'stuff' came out of Butters through the vent - could it, if it had gotten semi stuck on the lead end and gradually been forced through the system - damaged or stretched the 'exit valve' of the gizzard? If so, could it (might it?) stay stretched - meaning some 'solids/unground' food will pass through? Or might it heal and or the gizzard muscle compensate over time to reduce what passes thought the 'exit valve' over time???
@BY Bob @RoyalChick ?any one else have some knowledge/experience/ideas on this????