Hello @Brian2591
I am sorry to hear you became ill and that the host did not respond to your wife's contact with them saying you wouldn't be able to travel. What cancellation policy did she book under??
I would suggest to your wife who made the booking that she claims on your travel insurance which is designed to cover just this sort of situation.
I can't understand why your wife felt it appropriate to do a charge-back in this situation - if the host was simply enforcing the cancellation policy your wife chose to book under.
You would obviously have no grounds for making a small claims court application as you did not make the booking and your wife would have no grounds if the host simply enforced the cancellation policy your wife booked under, just as you would not be entitled to a refund for a non refundable airline or concert ticket.