My favorite blogger is Last Mom. She recently had this blog (hope she doesn't mind the link being here, I'm going on a limb and assuming an extra link to her page can't be bad ;) ): http://lastmom.com/hugs/
It was very eye opening for me.
It never occurred to me that PTSD was the reason for kiddo being a little hesitant on hugs. Since it's more from those closest to her, I took it as purely attachment based and try to adapt to it and give hugs where we can.
I read this to my hubs (since like Last Mom and her family, the resistance is more towards the dad) and he had that lightbulb moment. He also has PTSD from abuse and he said "Ah man, I don't know why I didn't get it before" and he clarified that yes, it took him years to get the whole hugging concept and be okay with it and he's still not okay with it in most situations, so it threw him for a loop that he didn't think about that being her deal too.
Know what? I think I've seen more hugs since that night, freely given and no pressure.
He doesn't reach for them now, but asks instead, and also that side hug recommended in the comments, yep, trying that too.