Did she get better Everet?
For others reading this post, people can have a brain injury (dead brain cells) though there is no sign on an MRI. Most people with brain injury are diagnosed this way and the correct specialist for testing and information is the neuropsychologist.
Well, therapy can sometimes help so don't wait on that. Its kind of like when people have to re-learn on how to walk... Hopefully she gets better, ill pray for you.
You may want another scan done, or have it looked at by someone else, second opinions can always help