I don't see any reason for Kamila, Daria, or Maiia to go back to juniors in any way on the national level now that they have competed a full season as seniors.
Besides having them compete at junior nationals will simply expose and put them into contact with A LOT of people again. And when so many people are still getting sick I wouldn't want them to risk it, especially since they have been lucky and able to stay healthy so far. Nobody knows when or where an outbreak can occur. A lot can happen between now and junior nationals with so many people involved so better be safe and not go
Besides having them compete at junior nationals will simply expose and put them into contact with A LOT of people again. And when so many people are still getting sick I wouldn't want them to risk it, especially since they have been lucky and able to stay healthy so far. Nobody knows when or where an outbreak can occur. A lot can happen between now and junior nationals with so many people involved so better be safe and not go