Keep looking forward to little Aths starting again and forget the school sports. As she is encouraged there she will thrive and it will show in her results. Next year if you think this will happen again it might be worth taking a sick day and having a day together.
Maybe over winter months try and find a sport that she can try, thinking of badminton etc if you think the she will be ignored in a team sport.

If she is OK with not getting in then leave it. Favouritism in sport has been going on forever so it goes to show it's nothing new.