Hi and thank you for writing JA
I concur with your physicians recommendations. While most psychiatrists today do not provide psychotherapy, your wife will benefit immensely from therapy and possibly even medications (which can be prescribed by a psychiatrist or a nurse practitioner). It is a huge change when one goes from being independent and able to self care to completely dependent. It is not at all unusual when people who suddenly find themselves disabled become angry and take that anger out on the closest person to them.
For your wife's mental health (and yours as well) go get her to a therapist and help her to sort out her anger and process it in a healthy way so that she will no longer direct her feelings of anger and frustration at you.
If she sees the therapist and does not wish to return, let the therapist help you with this. We have a good deal of experience with clients who do not think they need our services and sometimes we are more effective with getting our clients help.
Let me know if you have more questions about this?