(Here’s my take on the scene if I was in this special so I apologize if this comes off as role-playing.)
 
I see Sunset by herself and walk over to say hello. “Hey, Sunset! Fancy seeing you here! What’s up?” I ask cheerily; I myself graduated from CHS a long time ago; my younger cousin Twilight told me she, Sunset and the other girls after being defeated in her Midnight Sparkle form following her releasing the magic that witch Cinch and the Shadowdolts pressured her into releasing which caused this mess in the first place, not to mention she also told me how Sunset yelled at her for putting her friends in danger which upset poor Twi to the point that she fled in tears.
 
She doesn’t see me right away as I sit down opposite her. “You okay?” Sunset lets out a very frustrated sigh as she looks up at me finally. “Oh, hey, Kevin. I didn’t see you sitting there right away; I’ve had a lot on my mind.” She tells me with irritation in her voice. I look at her with a raised eyebrow as I can tell she’s bothered by what’s been going on recently. “I ran into Pinkie and the others too; she also looked really upset so when I asked about you she said you two had a falling out. You wanna gimme the deets behind that and why you cannot calm down?” I ask as an offer to hear her vent. “I can’t calm down because I’ve been stuck in this stupid time loop for three weeks and it’s driving me crazy! Not to mention, Pinkie’s gotten us kicked out of the festival numerous times thanks to her antics! I mean, first she wanted to win that stupid tandem bicycle, then ran off into the hedge maze and got us both lost, got us covered in paint which we both had to clean off our clothes, followed by her wanting churros which led to us getting thrown out the first time and all I wanted to do was to see Postcrush! ARGH! Pinkie did that so much to the point where I told her I hated churros along with how annoying she was and she ran off crying after I confronted the Dazzlings about them having the Time Twirler, which they didn’t!” She replies angrily as I simply sit there and listen.
 
“I mean, don’t get me wrong; Pinkie’s my friend and I love hanging out with her, but she ruined our chances to see Postcrush over and over again! I just…” Sunset looks like she’s about to cry as she looks away from me. “I just don’t know where else to look or what to do.” “I take it you talked to Equestria’s Twilight about all this then?” I ask. She nods her head yes though avoids making eye contact with me before I put my hand on her shoulder which she looks at me in response. “Look kiddo, I’m not quite the expert on magic like your pony friend in Equestria, but, in my humble opinion I think you’re looking at the wrong people. Have you ever considered the possibility that there’s one or two characters you may have, oh I dunno, overlooked or didn’t think of?” I ask her. “Huh? Who are you talking about?” She asks. “Call me crazy, but…there was something peculiar about Postcrush that I happened to notice when they were playing. Kiwi Lollipop, the lead singer, had some kind of device in her hair that, if I’m correct, does not hail from the human world at all. Maybe THEY’RE the reason why you’ve been stuck in this time loop and not your former enemies, the Dazzlings.” I reply.
 
“Just throwing that out there.” “You know what, you may be right!” Sunset says excitedly at my suggestion as she stands up. “I need to find Pinkie and apologize, then we’ll get to the bottom of this! Thanks!” “Any time, kiddo! Any time! Oh, and give my regards to both your friends and Postcrush once this has been resolved!” I tell her as she runs off.

In the book star swirl do over sunset is stuck in the time loop all throughout the book and can’t get out of it.