Given that your daughter is the youngest child, yes, I can believe she can see emotional challenges but never had the skills to be able to do anything about it. Yes, it’s very possible she may have some complex ptsd challenges.

I was the youngest myself and struggled with seeing how my sister hated my older brother and I did not like how my father picked on my mother and I knew my mother tried very hard to be a good mom. (This can happen in reverse where the dad gets put down even though he tries very hard). Children do not have the social skills or power to do anything.