They really need to nail down a consistent level of power for Twilight.
She's inconsistently able to teleport at-will, teleport accidentally in a panic, or not teleport at all. She's also able to magically manipulate Fluttershy's movements directly and cast what amounts to mind control enchantments. Even her horn glow color was suddenly a different color (red) in this episode.
Given Lesson Zero's power, it would certainly be hard to come up with challenges for Twilight that aren't either god-tier or related to her own personal issues.
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"That is why war is so tragic. To win means to make victims of your opponents and give birth to hatred." - Kratos Aurion, Tales of Symphonia