I didn't read what you put in the trigger warning, but I do believe that at certain points of deep stress I have just created a new part to deal with things. I don't do that any more.

I am working on being able to switch back to adult when I want to. I would say that I am making progress with that. I do not deliberately switch to young parts, although there are some situations where it's like I know that a little will evoke the response I want so she steps up.