I don't think the "level" of his golem matters much. If you remember during the tournament arc, his intermediate golem blocked an advanced water spell because he has so much more mana than anyone else he's faced so far. He can even refine his summons easily mid-fight, as we've seen many times already. Although, she has whatever this new ability is that lets her control a golem without using any mana, so that might make for an interesting fight... hopefully.