What a terrible trauma for all of you, and how wonderful that you are pulling together around your wounded child.
I know you can love and mother her in the natural way you would care for anyone you love.
And as to how to talk about it, let her tell you when she's ready--it may be she just needs you to listen, and you can process your mother-anger with your spouse, trusted friends, or here. Her healing could get slowed down if you own needs come into it. (I personally would like to come help you remove his fingernails, however.)
. In the meantime, calm company, maybe a lot of cpeaceful things like playing cards or sewing together, might be calming and comfort her, help her heal.
My prayers for you both (((Moonlight & D)))