It seems, based on what I've read of their descriptions and seeing some clips of Irene on Youtube, that both fighters have an equal shot at taking each other out. Irene's speedy sword style would be a thorn in Diana's side considering her vulnerability to bladed weaponry and being grounded for this battle. But Diana also has her superhuman strength, reflexes, speed and Lasso to help her out as Irene still has the durability of a normal person and doesn't seem to show any skill in unarmed combat. The Lasso can also function as a whip meaning Diana can attempt to disarm Irene with it and get a quick shot on Irene. One blow from Wonder Woman and Irene will be out.