I agree with the picking it up amazingly part, however, you gotta remember they weren’t 100% in the dark, they did go to training/workshops before adopting her.It's gotta be terrifying to jump from no children to a hyperactive pre(?)schooler without any of the experience of realized of how durable children can be.
But these two seem to be picking it amazingly well. That taste of darkness in the past makes the sunny optimism of the present that much sweeter