Exactly. It's irrelevant.
How would you photograph it to show that she's not "different?" No matter how you photograph someone who has a condition that is out of the norm, they're going to appear different to the viewer. That's the nature of the beast.
Have you seen the other photos in the set? They show that the lady is not 'different'. This photo is unlike the others in the set. As I said, if the shoot was to show someone with a stoma, and to highlight it, it failed. If it was to show someone living a 'normal' life with a stoma then it succeeded, except for this shot. I don't feel uncomfortable seeing this shot, I just think it's being shown out of context.
So it doesn't make it better to just get rid of the condition altogether in the photos. It just makes the point stronger that they are different.
I'm a Type 1 Diabetic but I don't expect to have a needle in my arm whenever I have my photo taken. I am me, not a diabetic. This lady is a model, not a model with a stoma.