Somewhere in the reboots, Amiel lost her clothing. Which I suppose is in-character.
It was specifically the Peasant outfit. Let me see if I can remember the order of events:
* I had her wearing the Robe of Shadows
* I rebooted the cycle
* I had the main guy go through his solo dungeon. Naturally, the cycle rebooted again after that.
* I had unawake Amiel join me and get the horn. I didn't check what she had equipped during that time.
* I went into the ambush in the ice cave solo. Since I had the horn, I fought the boss there.
*I rebooted the cycle again to test if the ambush went differently with everyone awake
* I had awake Amiel join me
* I noticed that the Peasant armor was gone. She didn't have any armor equipped (since the Robe of Shadows was gone), and the Peasant armor wasn't in her inventory either.