This is really ahrd news; no diea what to say, but I hope you are strong.. your little one will need that.
It might go okay.. theres those rare cases where it turns out okay; but sometimes theres no up-side .. the treatment where they remove half the brain, thats freaking terrifying.. but at least one fellow turned out smarter than average despite that.
In the end though... even if the child has limited use of parts of the body or other problems, she'll need your strength; I can't imagine seeing her now, wiggling around normally, worrying about what Could Be. It may well be a hard time, but the real life upside is still there.. she's your daughter, she will bring joy to your heart; children have amazing strength and resilience, the strongest determination for life there is. She'll make it, and she will smile up at you, and you can be there, and there will be the strongest of bonds. Your lives will be rewarding all the same. It may not be what you had expected (what is?), it may be hard as hell, it'll certainly be emotionalyl challenging.. but dont' let it make you bitter, try to remember the smiles as they come.
A buddy of mine got cancer and died way too young; he didn't gripe in public much, but he griped in a private little blog (which is still up, sort of creepy.) The "I'm still here" blog... anyway, he used to gripe over 'why is it when I go to the cancer clinic, I'm surrounded by 80 year olds; its not fair, they got their whole lives..'; heart breaking. But on the other side, he got his life, short as it was, and enjoyed it, and lived it, and will be remembered for his joy.
Give it your all, our hearts are with you.
jeff