I'm so sorry you are facing this. May she heal quickly and completely and may you remain covid free. This attitude is making me furious as well. I know so many people who have had Covid multiple times. I wish everyone understood there is no way to get it over and done with. Many of the same people like to call covid just like a cold. When you cold a cold are you protected from future colds?
I also wish the press made a bigger deal about nursing while vaxxed providing some protection for little ones. You have done everything you could. It isn't fair.