I agree, it was a very nice and helpful thing for her to do. And I think the documentary helped us all understand what her role exactly was, and I got the impression that she did genuinely want to play her part and help, as there were no awkward interactions that suggested "this was for the cameras" and that at other times she is tucked away in an office.
Two things did bug me: the first was her smugness, but I've accepted that that just goes with St Hoefia. The second was her hair dangling down and the tea towel on her shoulder. Her hair was long enough to be gripped back, and really a hairnet, apron and gloves should be won at all times when around preparing or serving food. I have long hair and often find a stray hair in my food after I cook, so I know how easy it is for hair to get in food. I'm surprised her supervisors and/or the film crew did not advise her to wear proper hygienic attire for the documentary. Also the way she touched the metal frame after sanitizing it bugged me. I have a friend who is chronically ill, and when things have been sanitised they absolutely cannot be touched again with bare hands. But I guess it's a different situation in this case.
But, I do commend St Hoefia for volunteering. She didn't have to and as hrhpita says, it is not a glamorous role either. I still dont see how her volunteering merits being awarded with "Corona Hero of the Year" or whatever she won, as thousands upon thousands of others are doing the same with little/no recognition or reward.