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What if Pixie's dust made X-23 hallucinate her trigger reaction.
Would that control over X-23 be strong enough to beat X-23?

Teen Jean made Laura immune to trigger scent, granted that may be irrelevant here.

Pixie's dust should still make her trip balls. Even if it didn't, Pixie wins via BFR.

Thanks for the update. X-23 can withstand unusual torture and make it through things.
Pixie though can be just as deadly and mabye more so. I think she might be able to take out a telepath.