In Island of the Blue Dolphins, Karana considers her sister, Ulape, vain. What two statements of proof does she offer to support this?

In Chapter 4, as Captain Orlov is opening up the black chest, Karana tells us that Ulape "drew in her breath in excitement" to see the sparkly necklaces. This is the first clue we get about Ulape's vanity--you usually only get excited about fancy jewelry if you're imaging how awesome it would look on you!

But later, in Chapter 6, Karana tells us directly about how vain Ulape is:

"Ulape had two boxes of ear-rings, for she was vainer than I, and when she put them into her baskets, she drew a thin mark with blue clay across her nose and cheekbones. The mark meant that she was unmarried."

Here, Ulape is getting herself all dressed up and wants to show off the fact that she's available. That's pretty vain! 

But that doesn't mean Karana doesn't love or appreciate Ulape. Karana also describes her as "never idle" (a hard worker) and thinks of her often through the rest of the book.