Hello, I'd like to help you with your question.
If your daughter has complex PTSD, then the symptoms you describe- depersonalization and numbness- can be attributed to the PTSD as part of the disorder. These symptoms are also common with anxiety
, which is part of PTSD. So the symptoms are not unusual at all. A person who has been traumatized will "remove" themselves through depersonalizing and being numb as a protective measure. It is often a way for the mind to disengage from the environment as a way to separate from the horror and shock of the trauma.
To help your daughter, therapy such as CBT (Cognative Behavioral therapy)is the best option. With someone who has complex PTSD, it is important to work on their interpersonal relationships as a way to help the person develop healing relationships with others. The need to feel connected and therefore safe is important. Helping the person find their own power is important as well. With PTSD, it is common for a person to feel they have no control over their environment. By helping them talk about what they can control, they can see the power they do have then build on it from there.
Also, help your daughter deal with the numbness and depersonalization by connecting her to her environment. Touching, smelling and using her other senses can make her feel she is part of her world rather than separate from it. This can reduce the feeling of numbness and being "far away" from the world which is often caused by the fear and trauma.
Here is a resource that may help:
I hope this has helped you,