Poor little girl indeed. RIP, and may her family get a huge amount of support and love right now.
I know this might be unpopular to say, but some dogs were not actually bred to be pets and never will be. Mastiffs and Bull Terriers (terrorizers, it's an old English word) are such dogs.
It sickened me to my stomach to see the photo of that lovely girl's pretty face and have to think of her ending.

If you have EVER seen a Staffie "go", you'll know what I mean.
Maybe 18 years ago now, my darling retriever was attacked by a Staffie that
she had played with every day for over two years. Neither she nor I ever had a worry about it. And, the day she was attacked, I saw it running toward her and gave it not a thought - until it literally ran up along her back and took her entire head in its mouth.
It's hard to explain, but when they "go", their mouths somehow become bigger than the dog itself. I kept having flash-backs of it for a time after and remember being amazed that I hadn't seen right down into its gut, it had opened its mouth that wide. I couldn't do anything to help her or get it off - no more could its owner, the fool; but I did keep battering at it with a quartered horse leading rope. That had a huge metal clip on it and, bashing it onver the head repeatedly, I still didn't even make the thing BLINK. I am not exaggerating. My dog had to have her face sewn up from under her nose to right round the back of her neck - from ONE bite into her by a dog less than half her size.
I still fear them coming near my little Springer to this day.
My neice kept one for four years; and then she got another, a pup, to grow up alongside the older one. When the youngest one was nearly five, she came home one day to find that the older dog had killed the younger one, but had received such savage injuries in doing so that it had to be put down too. After almost five years "peacefully" together, they had effectively kiiled each other off.
Vile things. And so utterly different when they "go" from any other type of dog you can name.
If you are herding or baiting bulls, these are the dogs for you, because they will keep their grip on a bull's heel even with half their own head kicked off.
If you want a lovely pet, pass them by.
Poor young Jade. RIP. And may her family get loads of love and support.