Fear
She should get a new nurse in the morning. The nurse should have directed her to take him to the hospital immediately.
You and the rest are correct; post operative sepsis is not anything you can put off till the morning.
However, since she probably will ignore you too, let's hope that the nurse is competent. "Gee, it looks OK to me! Let's wait and see if it gets better." Bah.
I guarantee that the surgeon who performed that knee arthroplasty would have instantly hospitalized MomwithHope's husband after reading her FR posts.