You may want to consider asking the physician if a consultation with a Speech Therapist is possible. The Brain Injury Association is a fine organization. Please do get in touch with them, as they can assist you with services that are available locally. This after 12 weeks of total lack of response. How much recovery is a question that most doctors would have difficulty answering.
Many hospitals offer patient services.
Speak with the doctor, nurses or folks at the information desk to locate the department. Please do get in touch with them, as they can assist you with services that are available locally.