Severe brain damage is not reversible. You can trot in all the therapists you want to give her encouragement, it won't begin to fix what oxygen deprivation for about 10 minutes did to her brain.
My opinion is that her parents should be made guardians to care for her, and that her husband should step aside. But I don't think for a second that she has been lying on that bed for 12 years ready to speak if only someone would give her some encouragement.