she lifted her arm not she lifted her armed
she didn't want any hypothermia not she didn't any hypothermia
No. Just no. What you claim you wrote here is a type of mind called Whispers of Consciousness (not a consensus name like say Split Personality, but it's the name I know it under). It's not a Split Personality kind of mind or a Multiple Personality kind of mind. So your biggest mistake is that Jacqueline is using the plural tense when referring to herself. It's always singular (me, I) not plural (we, ourselves) with people like that and I would know since I'm one of them. So no plural.
There is a fascination with the mirror, but the person never sees their reflection talking to them (distorted or moving of it's own accord sure, but it's only visual input as there is no sound).
There are multiple modes of thinking and they are separate, but it's a single self meaning that when a person willingly switches between their own whispers it feels like changing hats (best metaphor I can think of right now), you take one off and you put one on and sometimes you wear one hat and sometimes multiple hats. There is always at least one hat/thought process ,but there is also always one mind/self and therefore there is only I.
Also yes thought processes not in use or even suppressed don't stay that way forever and have to be dealt with or they will surge. So what you are describing here is a surge of a different thought process that has stopped being as suppressed as it was with Alcohol. And yes sometimes when I want to focus on only one thought process I drink too, but I know better than to get constantly get Alcohol or Adrenaline to keep myself focused. That way lies the Siren.
Now the Siren is what happens if someone like Jacqueline or me suppresses one of their though processes for too long: It starts with whispers being heard of your own thoughts and seeing something in the corner of your eye. Then if a person persists in suppressing their thought process the whisper upgrades to a hum crawling up the back of the head and either seeing your reflection distorted or seeing yourself from outside your own body in the image (sometimes vilified and sometimes pure) of the thought process you've suppressed. Then your own thoughts from the suppressed thought process start to intrude into your regular thoughts and then if you persist in suppressing your thoughts instead of dealing with them something breaks (it has been described in multiple ways: the sound of a snapping twig somewhere off and to the side, the feeling of a glass pane breaking at the back of your head, the smell of the ocean dragging you sideways into the depths, ect.) and you have a fun time (in the context of a fun time ball) of thinking with nothing but that thought process for a period of hours on end. You can barely get a thought or two in your other thought processes and good luck remembering those thoughts. The thoughts you think with the suppressed thought process tough? Those stay with you for weeks at the shortest.
So replace the plural with the singular, disassociate the visual and auditory hallucinations and you've got a soldier with Whispers of Consciousness that has been stepping on at least one of the hats in her mind having said hat forcefully jump on her head and then she tears it off and steps on it again.
Hope this was constructive.
Alright now that I'm at home I can respond to this in a bit more detail.
First off Jacqueline only experience's visual hallucination's in the omake.
She's not responding to anyone or anything, she's not hearing voices. She's talking to herself, trying to explain the appearance of the hallucination, then trying to make it go away.
Second off, The "Different Hats" thing you brought up actually puts to words what's happening pretty well.
As for the plural issue, The parts of Jacqueline that are in control are actively trying to disassociate from the thoughts and feeling's they are suppressing.
It's why Jacqueline acts like the hallucination is separate person from her, despite that not being the case.
Notice that the girl in the mirror is often referred as ghost or a phantom, as something dead that lingered on.
The Jacqueline that's in control, want's to bury all those thoughts and feeling's and is thus denying that they are part of her, that the person who felt and acted according to those suppressed thoughts and emotions is dead.
Basically, she's actively changing it from "I/Me" to "You/We."
I might still go and mess with that part of the omake, to make it more compliant with what you've described... but I kind of like it the way it's written.
Thanks for the feedback! I did fix the grammatical errors you pointed out.
I'ma gonna go take a second look at it and see if I can make it more compliant with IRL psychology, but if I can't do that without basically axing and rewriting half of the omake, then I probably won't.
Edit: I went and messed with the plurality thing, As I said Jacqueline is actively trying to separate herself from the suppressed thoughts and feelings, so she keeps trying to refer to the hallucination as a different person.
But since that's not actually the case she will often slip back into saying "I/Me/My"
I actually like this better, it adds a sense of discordance, and emphasizes the instability of her mental state, while also making it a bit more clear what she's actually doing.
Thanks
@Dmol8