Had my knee replaced on March 12. Two days later all elective surgery was canceled do to covid. Went to the physical therapist 4 days after surgery and told her I wasn't coming back and to give me a protocol to follow. She was very receptive and stated they weren't taking any new patients after that day anyhow.
I was diligent with the protocol I was assigned and did it 3 times a day instead of 2. Two weeks in I got on our stationary bike and that was the clear ticket. The first couple of revolutions are killers but after that it's bearable. We called the physical therapist and she said the bike was a good idea, no resistance just motion, 2 miles per sitting.
After 3 weeks I was walking with a cane and a week after that on my own.
I hate ice so I did just the bare minimum and got by on over the counter Tylenol.
Your wife will be just fine if she keeps working it.
I am 69 years old and have had a new aortic valve, both shoulders rotator cuff, carotid artery clean out, colon cancer surgery, hernia repair, graft bypass, and 5 stents. The knee surgery was almost enjoyable compared to a couple of them.
They tell me my other knee will not be far behind for replacement. It is good to be able to walk more than a few steps before having to rest.
The therapist told us "motion is lotion".
Good Luck and Good Health!