What really helped me is a silly saying I read online.
'Thoughts are not Santa Claus and they cannot hurt me'.
Became a bit of a mantra sometimes and I still have a Santa figurine at my keychain... and a Santa in a semi-visible position in my office (easily visible for me but not for the person sitting at the other side of the desk).
I've never had a flashback like your DD. probably because I'm so 'good' (it's not really good, obviouly) at shutting everything down and because I'm older. (But the down shutting has many negative sideeffects, so I had to 'unlearn' this.)
I agree, she needs something to bring her back to the present.
I grew up in a country where Santa isn't really done (Santa ismore of a thing nowadays, but not when I was a teen/kid. And we had Saint Nick, but that's somehow different, and he was blue in my elementary school... Anyhow). so for me it's a double thing. "You're in the Uk, you're in your office (bedroom/kitchen/car). These are your thoughts. They are like Santa clause. Santa cannot hurt me. Santa cannot hurt anyone."
Some people wear scarfs, because when they were grabbed their necks were exposed, for example. So, it's a way to distinguish.
I would have never thought of a cuddly toy, but it sounds like a great idea.
Maybe at a later point a hobby that promotes body awareness and control (maybe dance, for example)? I do martial arts and it has helped me a lot.
But I personally do think that one of your next goals needs to be to get DD to talk to a counsellor. (A good one, btw. There are many kind of shittty ones around, imo)
But yes, kate's point is imo very good. these are all personal experiences and we're all different. And in my case my trauma wasn't in my childhood, which makes it very different as well. Well, she actually has already said all that's to say about it, in a much more eloquent way.