If the Thunder Dragon Magic progressed further, it would be enough to kill her.
Seeing that they were about to be caught up, Ivita used Dragon Palace Magic to summon a Rubber Man. The Rubber Man landed like a massive rubber ball on the giant bird's head, leaving them a distance behind Ivita.
But the Rubber Man was also frozen.
Ivita had originally planned to summon Tide Fishmen, giant Water Dragon Soldiers, and three sea monsters with the strength of Great Knights. Upon careful thought, though, using Water Magic against Ice Magic seemed nonsensical.
However, using Thousand-Year Fire to attack the Ice Witch should elicit special effects, but it would also cost her the Fire Magic that protects her.
Now, she can't afford to waste time with the Ice Witch. She is not desperate, there's no need to sacrifice her trump card.
Anyway, she was in no hurry.