If he wants her to keep it up, then she'll try! She'll try to somehow.. keep up.. not stressing even though she's actually stressing.

Okay, maybe that's a little hard. But she'll try!

"Mister Piccolo, can you see how much further we have left to go..?" She figures she might as well ask that, just so she has something else to think about other than her own worries. See, she's already trying to not stress out too much!