Excellent, now she is roughly on par with Bi-Han :)
Now, I believe that Elsa will win because she is supernaturally more powerful than he.
Not only she can shoot icy projectiles, but spray at a sustained rate like a hose.
Also, she can create her own army from Olafs to Marshmellows.
Her own armor and weapons can be as strong as steel. If you remember the music video, "Let it Go", do you remember the chandelier she has made? Do you remember how a crossbow dart broke the icy chain that held that massive chandelier? That is a lot of weight the chain held. If it can hold that weight and not break, then imagine how strong her arms and armor would be?
Finally, she is intelligent. Monarchs like her must know how to run countries well, which includes leading her own military. In war, men and women in her position are expected to lead armies to battle. She has the potential to be the David against the Goliaths of armies, and win.