Aunt Bon-Bon says kids are always very melodramatic. Lyra says that most adults forget how dramatic it is being a kid.

Double-cross sounds a little harsh. You just want to get away from them.

A simple enough question. You ask.

Berry Pinch forces through a yawn before answering. “Black mail; why else would anypony be here?”
“I was invited!” Zipporwhill excitedly replies.

Diamond Tiara and Silver Spoon return, looking annoyed.
“Aren’t you two done yet?” Diamond Tiara looks square at Berry Pinch, “I thought you said this wasn’t going to take very long.”
Berry Pinch walks towards Diamond Tiara, shoves the clipboard into her chest, and starts walking away, “I’m going home.”
“What?!” Silver Spoon exclaims, “If you leave now we’ll-!”
“You’ll what?” Berry Pinch replies over her shoulder, “Map is in your writing-style. I was never here.”
Silver Spoon rushes over to Diamond Tiara and gasps at the map. Diamond Tiara waves Berry Pinch away, “Let her go. She knows this isn’t over.”
Zipporwhill flies over, looking worried, “Where is she going?”
“Don’t care,” Diamond Tiara replies coldly, rolling up the map, “Just like I don’t care where you go. But it won’t be with us.”
Her wings stop beating and Zipporwhill lands slowly, “But… But you said we were having a sleepover!”
“Tsk. I don’t remember ever saying that.” Diamond Tiara puts a hoof to her mouth and turns to Silver Spoon, “Do you remember me ever saying that?”
Silver Spoon taps her chin, “Something about coming over for the night. Nothing about sleeping. Nothing about staying.”
Zipporwhill’s lowerlip quivers and you can see tears forming in her eyes.
“Too bad,” Diamond Tiara brushes past her, “But don’t worry. We’re sure you won’t get in too much trouble when you get home.”
“Come on, Zipporwhill,” You hear Berry Pinch call back. Evidently she turned around and came back. “You can spend the night at my house.”
Zipporwhill quickly flies over to Berry Pinch, her voice still shaken, “But-but won’t your mom be super-angry?”
“Trust me, she won’t care,” Berry Pinch replies and the two disappear into the night.

After watching this scene, you turn around to berate the two bullies for their horrible behavior, but they’ve already walked away toward one of the castle windows.