So Rainbow has the ability to bring back the dead by using a "Sonic Rainboom". Oh my gosh, that's disturbing! Within the range of the "Sonic Rainboom", there will be dozens of corpses walking around. Nopony is going to feel safe anymore!

Will Rainbow Dash be beating anybody up in this story? Will she be reaching Unstoppable Rage levels of anger? Will she be giving out any No Holds Barred Beatdowns?

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Dunno~. Rainbow Dash as a dead pony is pretty careless in that she literally cares less, but is there a Berserk Button she's got to press? And who would press it? Just pray that any changes in her psyche are good plot points and not Character Derailment.

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True, true. This could be a thing that exists. Or you could check back in a few hours for the next chapter and challenge your assumptions. Like, in a huge way.

7277502 Hmm, alrightly then! I'll wait and see how this goes.

This is intense. O.O I wait eagerly for the next chapter.

Well, looks like Rainbow Dash just unintentionally broke the balance of life and death by coming back to not-death herself and performing her not-Sonic Rainboom. Looks like now she's going to have to fix her mess. Poor Rarity. She had the words right there, then the mouse comes back to life and she faints like classic Rarity.

You're missing another incident for the cursed weather balloon, too, where the Mane 6 minus RD decided to take it to the Wonderbolt academy right as Lightning Dust and RD lost control of their tornado.

but she was everything I’m not.
And by that, I mean, overly confident, rude, lazy, and prone to obsessing over Wonderbolts and Daring Doo.

Not a fan of this phrasing. On my first reading, I took this as RD saying FS was overconfident, rude, and lazy, not herself. Not really sure how I'd improve it, though.

she was quickly the best Wonderbolt

This should probably be either 'she quickly became' or 'she was easily'.

why the Wonderbolts were so easy to recruit her

Easy here should probably be either 'eager' or 'willing'

But they’re silent not.

Now

the Wonderbolt’s events

This should be either "the Wonderbolts' events" or "the Wonderbolts events"

At least a thousand pounds, maybe thousand for bigger ones

Thousands?

And stops. Because she sees a mouse sit up.

Oh no. Ohhh shit, you are not doing what I expected. I never thought Rainbow would be the cause.

What if Dash became the alicorn of death and got her own zombie kingdom? That would be cool in my op

Wow! <3