if you really want to lower Robin's trauma, you can play around with commands on the browser's consoleI know, I am using cheats, but you can't cheat/change every single part of the game such as Robin's trauma.
i can share you a command to use : but be certain to back up your save before you use it, as I can't guarantee it will won't break anything
SugarCube.State.variables.NPCName.at(16).trauma = 0
i'd personally recommend to set Robin's trauma to 1 and then wait a day, in order to prevent potential sequence breaks