The only reason I know what she's saying is because the lyrics are translated in the CD liner notes. I don't really know the connection between the English and the Hawaiian, just the overall message of the song.
During my early years of language learning, I considered studying Hawaiian, but there wasn't much material to work with, so instead I came to consider Hawaiian (and Tahitian) strictly to be enjoyed through music. :)
"Himene Tatarahapa" ~ Repent Hymn [Tahitian]