Purah had her mouth open to try to pry some sort of reply to Link out. He had asked a good question, had apologized, then tossed an accusation at her all in the span of about thirty seconds- that was tough to keep up with!
Then Zelda's comment cut her brain off halfway through trying to come up with a proper retort, and she shrank a little in her dress, poking her index fingers together guiltily. "I wasn't trying to be mercenary," she protested. "It's expensive to run all this equipment, and the funding we had from the castle that we took with us was long gone. Symin and I do need to eat at least..."