On second thought, there is nothing wrong with the composition. No need for cropping. Just look at the intersection of thirds:
Technically, I agree with you. But the visual 'weight' and size of the square doorway and the vividiness of the dress make it a single unit which appears lmore central than it actually is so I think you need to 'overcompensate' by exaggerating the third as done in Perter's crop.
Both work well but I just think the weighting given by the crop adds a bit to it.
But I do like both.
It is a shame when modern obsession with technicalities (in this case 'the subject must always be sharp') is an immediate barrier to what otherwise is a good composition. But if her dress had been any other colour but red I doubt it would have worked as well.