I loved that scene when Fluttershy finally turned into "Saddle Rager" but I couldn't help but wonder what Andrea Libman's voice sounded like before they pitched it down. So, yes, that IS her shouting through the whole thing.

Music at the beginning is my own cover/remix of Anthropology using Pinkie Trombone.
Vector from here http://canon-lb.deviantart.com/art/Pinkie-Pie-and-Fluttershy-Cheek-hug-338277703
Nothing bad intended.
Everything belongs to whoever owns it.