My apologies in that Enrich 32 IS a ration balancer adl2kdl2
, since everything seems to be affecting her, I wonder if this is her way of reacting to ulcers??
My Arab has mild ulcer issues. With him, when they flare up, his tummy hurts right after he eats his supplements and rice bran. He doesn't get grain and the EquiPride is soy free. When his ulcers flare up, he will not go to his hay right away but will sort of stretch out instead.
Maybe the nervousness in your mare is how she reacts to ulcers.
Without putting her through a scoping event, you could get some Omeprazole and give it to her. We did that with my Arab; the vet said if it was ulcers, he would be better in 24 hours. He was better in just a few hours.
Omeprazole won't hurt her and if she stops being nervous after eating, you would know she's dealing with some sort of "acid indigestion".
The next step might be to have the vet do some blood work on her.
Other than those things, I'm at a bit of a loss