I think they could make her quite a few more outfits. Just because they are made out of the same basic materials doesn't mean they all have to look the same way.

Look at how Kirsten's are almost all the same pattern, but different fabric makes a difference.

They could have different sashes, beadwork, etc. on the dresses and perhaps a set with leggings, as suggested.

I'd love to see backdrops and ground-covers too, and that would probably be good for lots of different dolls if it was a generic set of nature backdrops (summer, spring, winter, fall, etc.). I'd love to buy that.

What about a separate fire and stuff to cook with? I want a fire, but I don't want the tipi. I'm not as familiar with the Nez Perce, but I know tribes in our local area had cooking baskets that were tightly woven. You put rocks in the fire and then into a basket of water to cook with. And they could give Kaya a set to catch the fish however this was traditionally done (I think they actually used trap systems, but I can't remember).