Here is all 3 Ostriches together. Orville, Miss Ellie, and new female Eunice.
Orville is clearly on the far right. Telling the girls apart is difficult from looking at them, but I think I found a way, although it's unproven.
Miss Ellie has a red band around right leg. Eunice doesn't. So in the picture. Miss Ellie is in the middle and Eunice is on the far left.
I'm not sure if my method is entirely correct, because I'm mainly going off the fact that Miss Ellie has always had the red band, before Eunice's arrival. So if any one knows another proven method, let the rest of us know.