I don't know what's going on with that. I selected her left eye and opened the grouping tool. I removed all materials and then selected only the Iris material and assigned a new material to that called LeftIris. Unfortunately nothing changed. The new material is listed but when I apply an altered shader to LeftIris I don't see any change. Hope one of her creators can come up with a solution. It would be useful to be able to change each eye for various effects.