Reception - I truly hope that your sister makes a good recovery. You're right - what she has, is a virus, and it can rob a person of their speech, and the sorts of things that you're seeing at the moment.
The brain needs to rest - hence recovery can take a while, but the doctors are treating her in the correct manner, and all you can do is wait.
I'll be thinking of you, and meanwhile, tigwig's right. Keep strong for your sister. I'm sure that as time passes, you'll see a good recovery - x