I totally understand everything you say about how your daughter reacted. I can safely say I have some bit of autism...all of my friends have told me I have "very high functioning" ASD(autism spectrum disorder).
The best way I can try to explain this is...think of social engagement for people with autism/ASD as an Extremely uncomfortable activity in prolonged doses. Even engaging myself as much as I tried to back in high school and even before, I found I never could fully "connect" with anyone, at least not on that level that I was always capable of perceiving "normal" folks engaging in...talk about a mind killer. That in itself causes PTSD
I can't speak for everyone, but what has helped for me personally is a combination of medical bud, active therapy, Getting Out regularly and exercising, finding and removing all bad influences/bad environments, and kicking my meds.
I mean, make no mistake, I'll always be "different" from those who Don't have ASD, but hey, I feel So much better now inside and out.
I hope everything is going well for you and your family too =) Especially her