Something like the child shows the natural grief for their lost care giver but doesn't continuously physically attack and ignore their adopted parents for months after placement.
My DC have never physically attached me, or ignored me. They grieved for their foster carers deeply and in different ways - they were very used to having to compete with each other and other siblings to have their needs met which brought different challenges.
The difficulties for me were pretty much the opposite. My two needed to be in touching distance at all times, they needed to be touching me, sitting on me, holding on to me for every second of the day, they needed a huge amount of physical affection. All of that sounds great until you understand that meant I literally couldn’t leave their line of vision, if one child needed me for something the other would also need be for something and if that meant hurting themselves, putting themselves in danger or breaking something that’s what they’d do. We had so many visits to A&E in that first year....
It would take me 45 minutes to unload the tumble dryer, because they couldn’t tolerate me being away from them. They’d be hungry but not able to let me go to the kitchen to make them something to eat. While knowing this was a need for then, it was incredibly suffocating for me to go from having my own space most of the time to literally walking round my house with two children physically attached to me. I couldn’t take my eyes off them for a minute and was pretty much touched out, my SW suggested putting them into school and nursery to give them some structure and to give me physical space for a couple of hours, which did help us all tbh.
Over two years in they are still very clingy, needs lots of affection and will gravitate towards me if I’m in the room, they have a great relationship with my DH, but it’s me they want to be with, sit with (on), they need to know where I am, what I’m doing, when I’ll be back etc.
It’s not always about aggressive or violent children, challenges come in lots of shapes and sizes.