Where are we now? (Undertale Au story)

Sky Crystalline is just a glitch in the game who managed to slip past unnoticed. Her first appearance was made during a genocide run. Her main purpose: to protect the fallen child. No one knows her true potential or forms...besides Frisk that is. After Frisk reset the timeline after the genocide run, Sky was once again lost in the coding. She finally resurfaced during a pacifist route, but there was a catch. Not only was she still suffering tge effects of her last battle with Frisk in the genocide route which left her at 5 HP, but the only ones who have any memory of her existence in that run are Frisk and Sans. Now finally free of the underground, Sky believes nothing else could go wrong...

until four girls fall from a portal into her room. Four girls who...look exactly like Sky?!

(don't own Undertale or any of the AU's used,I only own Sky, Portal, War,Time, Serenity, and Arisa)