Ok so I'm new to wikia so idk if anyone will even read this... anyway!

I need friendship advice, fast! In March there is an anime convention I've been planning on going to and I want to cosplay as fluttershy :3 and then it was really great when I got my sister(best friend, sister by heart, yknow?) into the show, and she's a TOTAL rainbow dash-ish person, so she wants to cosplay as dashie. Before I knew it, friends were asking left and right to join a my little pony cosplay group! I was super happy, but things have turned sour. Another friend of mine who originally agreed to being princess celestia decided that she would rather be rainbow dash. I told her that my sister is dash, and that she would make an awesome derpy hooves, but she won't budge. so I asked my sister if she could even go, and she didnt know, and I told her that the other friend wanted to be dash, so she got mad- ahhh! it's so out of control and I want to make all of my friends happy but idk how :/

any advice?

All eyes on Fluttershy S1E7