There are many things to do:
There are many discounts offered for medical reasons. Power bills, lifeline for telephone, water, etc. It can add up. Some states have programs for
"in-home care" will will reimburse for some of the hours caregivers put in - including spouses.

The ACS will pay for mileage (up to $250.00) for travel to treatment (has to be over 60mi.) They also provide rides and drivers.

Then there is SSDI.

My church helped a lot, paid bills for me, etc.

One anonymous donor paid for the first 3 months of my health insurance (which was around 3K).

A good place to start is with the hospital social worker.

A caregiver support would be a great help also, at least she would know that she is not alone. Counseling at the very least. Sometimes just getting people to talk about their fears can relieve a lot of the tension and fear.