Man, she is very good. Kids like that amaze me. Thanks for posting, a was clicking around youtube and found a very good choral but something went wrong when i tried to bookmark, i'll see if i can find the link.
Edit, here it is. a college chior singing "A song of Peace," which like "Oh, Lord thy God" (or something like that, lol, i forgot the title) has the same melody as what is at the end of Sibelius' Finlandia.