As Jasmine and the others began retreating, Olivia certainly detected that there was a pressure that was being applied on the ice that she had solidified to prevent the tsunami from reaching the territory.
Currently, she was not trying to utilize the ice to spread further so that she could freeze more water, considering that it was better if she concentrated in a single place, to make sure that the wall that she had formed was extremely strong, to prevent it from being breached.
That was the exact reason why she had not been attacking. The moment that she decided to attack using the ice element, it was definitely going to increase the consumption of the energy, and it was definitely not going to be capable of matching the speed at which she was recovering the energy after taking the potions.