Mirai doesn't seem to be very musical. So are most American ladies. Mirai in my opinion is better with show tunes. I liked her Gatsby program. Miss Saigon is boring but I can understand the "safety first" approach in OG season. You don't want to cry after a bad skate to upbeat music.
Mirai had the Charleston in Gatsby to liven things up, and suicide in Butterfyl for the ultimate melodrama. Miss Saigon falls in love and gets left behind, to some rather weepy romantic music, and IMO, I don't see Mirai being able to do anything much with that. The Winner Takes it All gave dumpage a bigger impact.