What is her derangement, exactly?
Skitter hates being
trapped, as it reminds her of the locker. Her passenger actually rewards her for getting trapped, expanding her range in what seems like either a reaction to help her escape, or an enhanced connection due to similar mental state to the trigger condition. She focuses
obsessively on her goals to the exclusion of all else (proving herself to the Protectorate, then saving Dinah, then averting the apocalypse.) She has a fundamental urge for
control, coming into
conflict with established authority in every instance she interacts with it, from her high school days with Gladly to her confrontation with Alexandria.
I very much doubt the meek girl who was bullied for a year and a half had many of these tendencies, much less at this level of intensity, before an alien parasite burrowed into her brain and rewrote her personality.
And where does it state that she shuffles her emotions off into her swarm?
Her determinator ability to persevere through extreme pain is a partial result of this (and Bakuda's bomb, which made it even more). Alexandria's Thinker power was unable to read her effectively due to this ability and the miscalculations led to her death.
After Taylor was nearly killed by Leviathan and then tormented by Panacea on her hospital bed, did she freak out and need to be pulled out of a state? No, she used her bugs to open her handcuffs and stumbled into Shadow Stalker's secret identity. When Taylor was hit by Bakuda's pain bomb, did she curl up and stop? No, she cut off her toe.
I'm not saying that traumatic experiences don't produce bad reactions, that people don't go into shock and get caught in hyperventilating loops. I'm saying Taylor doesn't, because she has frankly been in situations just as bad as this not very far into her career and never exhibited such a tendency.