The way that I remember which one is which is that kela has two accent marks, and keia only has one. So this_ is closer than that_ _ is.

I hope that makes sense/helps.

"Hawaiian" is describing the "woman". In Hawaiian, the descriptor goes after the object...examples: Wahine Uʻi (beautiful woman), penikala ʻulaʻula (red pencil), ect. To say "that nice woman is Hawaiian", you would say "He kanaka Hawaiʻi kēlā wahine ʻoluʻolu" or "He Hawaiʻi kēlā wahine ʻoluʻolu".... there's different variations of how to say someone of Hawaiian descent so it's a bit tricky. Hope this helps a little.