At the beginning of Chapter 13, we have Elinor's expectation of the excursion to Whitwell: "She was prepared to be wet through, fatigued, and frightened ..."

The "wet through" and "fatigued" I could see; but "frightened"? So far, Elinor has not shown any propensity to be frightened -- certainly not by anything encountered in the previous chapters. What new danger could be lurking at Whitwell?

About the only thing I could think of was that maybe Elinor was nervous about sailing on the "noble piece of water", and not just because of the probable dampness. Perhaps she couldn't swim?