Absorbent materials like puppy pads, and her favorite blanket. Anything that 'feels like home'. Buy the crate far in advance and get her used to it at home already.
BTW, 10lbs should not be too big for the cabin. 10 lbs is four-and-a-half kg, and even the Korean airlines who have the most stingy weight limits among airlines allowing pets in the cabin allow 7kg animal+carrier combined weight which you will definitely not surpass with a 10-pound dog.