After watching the show in US now....I can think what might have went against NIHIRA even though she sang well....
1 - The Song Factor: Was tough..she sang well. BUT when audience finally compared to Vinit/Hema/Himani ...it fell short!
2 - The AV factor: The AV shown on that show was NEGATIVE! It showed people saying negative about her dancing(performing) cababilities.
3 - The ID factor: ID, her mentor! He selected wrong song. Not only that she supported Himani at this final stage when it was not that much required.
( Excluding any Golmal's (if any) by Gajji)
BadLuck!!