No matter how fast Queen Mab created the ice soldiers to replenish the ones that were destroyed, they were already decimated in the process of making it.
Her speed of creation was further impacted by the constant barrage of small, fast metal projectiles, which she needed to use a combination of ice and telekinetic barriers to stop it before she could remake her ice soldiers.
Shiva did not pull her punches as well, causing it harder for Queen Mab to counter attack and it was indeed a battle of the Ice Users.
Even when Queen Mab saw the slightest opportunity to breakthrough the series of attacks, their commander Nubwort somehow had the perfect timing to disrupt her, allowing the Orc's offensive to continue on.
