Their twitter says
"Brownsburg wins AVI! 2nd-Plainfield, 3rd-Anderson, then Castle and Milton."
I am assuming that means Castle 4th, Milton 5th but I guess it could be a tie.
This is the most recent schedule of performances for Avon:
Single-Gender Division:
New Prairie "Sing Sensation" - 8:53 am
Anderson HS - "Vocal Elegance" - 9:19 am
Milton - "Octave Above" - 9:45 am
Castle - "Knightingales" - 10:21 am
Brownsburg - Starlight Voices" - 10:47 am
Plainfield - "Femmes Fatales"- 11:13 am
Looks like Milton is the only school from outside the state of Indiana this year, and only the second outside the state to compete here since it began.