After pictures from her phone get posted online, that human five confront Sunset with the information. After discovering that she and the others had very different ideas about how to confront her, Rainbow Dash finds herself defending Sunset from the rest of her friends.
Rainbow siding with Sunset didn't change all that much. Sunset was still successfully framed, Sunset still lost most of her friends, Sunset will still go back to being the most hated student at CHS, but she won't have to face any of it alone, and that will make all the difference in the world.
Meta stuff follows.
Let's talk about combinatorics.
There is one way for none of the five to remain on Sunset's side, there are five ways for one of them them to side with Sunset, there are ten ways for two of them to do so, there are ten ways for three of them to do so, there are five ways for four of them to do so, and there is one way for all of them to do so. Out of these thirty two possible configurations, almost every Anon-a-Miss story sticks to the first one.
I did a tally once upon a time and what I found was that 96.9% of possibilities were almost never explored, and 87.5% were never explored at all (no "almost" necessary.) These figures get rather more abysmal if you're looking at who did or didn't side with Sunset from the start. The rare stories that have one or more of the five side with Sunset tend to have the initial confrontation go down pretty much canonically, and then have someone have a change of heart later on.
So, in the interest of stuff, here's a thing where Sunset has someone on her side from the very start. Most of the first chapter was released two months early on my Patreon page, for subscribers only, as you might imagine.