PTSD symptoms can also take up a lot of life and attention naturally. "Dwelling" on the symptoms of PTSD can be a way to productively get better. It can also be unhealthy too.
There are ways that some people sometimes do obsess about an illness. It happens in all kinds of illnesses. I used to run an autoimmune disease support group. There were some that spent appropriate amounts of time sorting it all out - which usually varies with how sick they were and how much it affected their life, and where they were in the healing process - including an emotional acceptance process. There are some that spent a lot of time on autoimmune disease because they wanted to give back and support others. There are some that go through a season of spending extra time focusing on autoimmune diseases to work through issues with it, and then when things are better, they spend less time. There were a rare few that were absolutely obsessed with their disease in ways that actually seemed quite harmful. I think this can happen for a very few people with PTSD too.
With PTSD, I think "dwelling" on trauma can be one form of intrusive thoughts, and thus can actually be a symptom of PTSD. I don't think this is any more right or wrong than having a an exaggerated startle reflex. I can’t just stop being jumpy. We can take steps to gradually work through trauma and use coping skills to be less jumpy. But using the word “dwell” is almost like saying we choose the symptoms. Heal the trauma, work on the PTSD, and the thinking about PTSD gets better too. It may also shift to spending time supporting others or spreading awareness.
It reminds me of a silly Bob Newheart sketch. To see the sketch, see this youtube video:
In the video, clients go into a therapist and they state their problem. Then the "therapist" tells them, "Stop it." And that's the sum total of the therapist advice. When clients talk about all kinds of symptoms, the therapist just says "well stop it." The clients push back, and get the same response. It's silly and funny because it's nonsense. Some people do choose to be sick, but that's a whole other diagnosis...
My therapist teaches trauma therapy. She has explained and showed me that they don't actually teach that much about PTSD in
graduate school in the US. They teach even less about PTSD in BA programs. Trauma therapists generally become trauma therapists through continuing education courses.
Your daughter’s comment is probably well meaning, but misses the mark. It is worthwhile to evaluate if the time we spend think about and working on PTSD symptoms and trauma is healthy or not. My own therapist tells me to take breaks from working on my symptoms and trauma therapy work – but this isn’t because doing so will make the PTSD go away. It’s still there! She always says that the PTSD will still be with me even during the break.