The Horse Whisperer, about a girl and horse who had an accident leaving both with injuries, there's some interesting trauma resolution. It doesn't say "ptsd" specifically, but it looks that way, for both the horse, the girl and the girl's family.
Robert Redford is in this one, another movie by him, with him in it is, An Unfinished Life, and that's about a young widow (played by Jennifer Lopez); she lost her husband in a car accident (she was driving), get's into an abusive relationship, has no-where to run, winds up at the father of her late-husband's farm. There was additional family trauma, not only that the father blamed the daughter in law for the accident which took his son, and also that he didn't know he had a grandaughter. The transformations in the relationships are interesting, healing occurs unexpectedly. The father/grandfather is played by Robert Redford and seems like a crusty old bugger, hard-working, the transformations to heart, healing and forgiveness. It's trauma, but not necessarily full PTSD, but tensions.
I love the Secret Life of Bees, the trauma there is of the daughter feeling reponsible for the death of her mother, the father also treats her harshly, it's a wonderful coming of age movie, and finding her own niche. Dakota Fanning stars in it and I think she's just awesome. Another Dakota Fanning movie is called Houndog, it can be really triggering because the girl is raped, it's heart-breaking, and resolutions happen around her connecting to the music of Elvis and the blues. Both are about trauma, but not necessarily fully PTSD though, some slight nuances of it maybe?
White Oleander is about a girl who's mother murders her own boyfriend and the girl is then passed through the foster care system, it's interesting how she reconciles, integrates. Michelle Pfifer, Renee Zelwiger, Robin Penn. Her bio mother is sort of a narcisstic-artist type, so the daughter grapples with that control to assert her own identity. Flashbacks are shown.
I don't think Hollywood easily invents these-- these are all based on novels.