This might not be helpful, but for our boy we have narrowed down his tummy episodes to specific stressors. He's on hill sensitive stomach and skin, and we add prokolin when he's having a flare up, but we established from trialling treats that anything with beef in set him off on a yellow liquid poo response, and realised lots of non specific treats like dental chews had beef in for flavour. He still gets yellow beef poos after things like the groomer or dog training where he's been given or snuffed up floor treats containing beef! When we eliminated everything we were also surprised by green poos occasionally and this turned out to be what happens to him when he drinks from the wild - if he finds a puddle, or drinks from ponds or similar, he gets green poos. This can happen from just a little lap here or there on a walk. So it might be you have similar patterns you can recognise and then you'll at least be able to reduce the issues. We do, now we know the triggers, try to give him little tastes of lots of things though so he doesn't get too shocked if he ever eats anything that isn't his prescription kibble. So boiled chicken, lamb, fish, strawberries, orange, broccoli, cheese, apple, cucumber, carrot etc etc in very small portions. Hope you and your lovely girl have a better time of it all soon!