you have a new client with neurological problems as a result to a C4/C5 injuries. I have no doubt that you have medical clearance to work with her and that you have consulted with her doctor and/or physical therapist, right?
That’s where you need to start. It is not a matter of throwing exercises at her that she can do, considering her limitations, but identifying her imbalances and trying to address those.
I looked at your profile and saw that you are an ACE Personal Trainer with 1-2 years of experience. I don’t want to step on your toes but be mindful of all you do NOT know yet. If I had a client like that, I would not do anything without the blessing of the PT who worked with her.
I wish you good luck.