I truly love this Indigo, also, I so want to laugh so hard at the finger challenge.

Yeeeeesssss, excellent, let the shipping commence. Seriously though, this is shaping up to be amazing.

Like this story can't wait to read more.
There only a few stories where Sunset meets Sunset and usually the human Sunset is utter bitch or in some worst.

“Oh god, we are so the evil universe.”

Ain't it the truth. Ain't it the truth.
Looks like this ship was sunk before it even left the harbor.

Wow...human Sunset is a maximum level bitch...something tells me she needs friends...or to be knocked down a peg or two. You got this Indigo!

“Oh, like in those TV shows where the hero goes into the mirror dimension and everyone is evil and has those bitchin’ goatees,”

Well, at least she's watching the right kind of television,

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Since Indigo Zap didn’t want to take any chances with people dodging her calls, ignoring her texts, or otherwise withholding the answers that she now so desperately wanted, she chose to arrange for a meeting with Twilight Sparkle and Sunset Shimmer, and refrained from giving the exact reason as to why. 

Okay, something's wrong here. She arranged a meeting with Twilight AND Sunset, without giving any information. She has every reason to honestly blow up and demand Twilight bring Sunset to her, but she doesn't, and that's fine. However . . .

Indigo Zap has no idea about the other dimension at this point. She knows that something is drastically different about Sunset Shimmer, but she isn't even thinking about the possibility that it is someone different yet the exact same.

So why is it that she reacts to Sunset Shimmer like this?

“Hey, redhead!” Indigo shouted as she raced over to them. “What’s your name?”

Twilight and Sunset turned their heads to the oncoming Crystal Prep student, both looking perplexed by the question. “It’s Sunset Shimmer,” the girl in question answered. “Did you really come all this way just to ask that?”

“Or so you claim!” Indigo accused, pointing a finger at her. “But if you’re Sunset Shimmer, then how do you explain this picture?”

She's acting like this isn't the same Sunset that was at her school, yet we have no explanation for why this is and an actual good reason for her to think this. Yes, as I said, she notices differences, but how can she rationalize those differences as so different that it couldn't be Sunset Shimmer? Once again, she has no idea about another dimension. In fact, they don't even know enough about Sunset to truly be able to say whether or not this is something she wouldn't do.

My main point is what's the point of bringing Princess Twilight into EG universe to prove to Indigo that it is really real if she was already thinking it wasn't Sunset anyway? She didn't even really approach Sunset aggressively in any way. The sister of Lightning Dust isn't being aggressive? That seems a little odd, especially considering what happened to Indigo.

And, sure, Indigo said she wouldn't have believed what Sunset said if the Friendship Games hadn't happened, but that shows even more how contrived it seems to be to have Princess Twilight suddenly pop up like this.

If this entire scene had been redone, then it could work out just fine. However, I have a problem with how you've handled this chapter currently.

Otherwise, this story has a massive amount of potential, and you're normal mastery of characters is showing very broadly here. I love where this story is going, and I'm going to be following this story intently.

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Well Indigo wasn't 'blowing up' because she's at least trying to be a nicer person to Twilight, given how prior said behaviour played a part in her turning into a magic-crazed demon who tore open a hole between dimensions.

As for her approach.... hrm, guess I hadn't thought about the implications of her exact word choice. I'll go make some tweaks...

edit: Tweaked

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Fantastic! I love the edit far more, and I can understand why Indigo doesn't want to blow up on Twilight Sparkle because she feels bad about how she treated her. I was merely saying there is no reason why she shouldn't blow up on at least Sunset.

The scene feels far better, and Princess Twilight showing up doesn't feel as contrived. It still seems really odd to just . . . drop everything crazy on Indigo at once, but then again, that's been the trend thus far. Of course, Sunset said it'll be just a minute, so she won't be there long.

“You mean condescending detachment and ceaseless criticism?” Sugarcoat asked.

Oh s*** that's a serious burn from sugarcoat