"If anyone needs to switch to another job quickly, keep us informed."

And by 'us', she was just referred to the maxed Chemists in general while taking out some of her High Quality Hi-Potion stock. Going into this battle, remembering the considerable amount of damage that could and would be done over the course of the battle, it would be necessary for everyone to keep an eye on their individual healths if healing wasn't able to be cast in time.