Elizabeth isn’t an antivaxer. She is simply afraid of the needles and the pain. There are adults who have phobias about getting shots, even with small needles, in the arm where you barely feel them. I have a middle age friend with that phobia. It was an emotional ordeal for her to get her Covid 19 vaccines. Those were small needles too, and you barely feel a pin prick. Not those large honking needles pictured in the show, in your gut, going in deeply.