I kinda think they should invite Amber to Champs camp, but not decide SA until she has gone to a challenger event with minimum score expectation. I would give her another chance, but this weekend was a problem to be polite.
If she does not do well, send Courtney and Angela to challenger events and pick the one who does better with a slight edge to Angela who did better at U.S. Nationals.
As for Katie... well she won here and good for her, but she won with a score of 153.67 which does not even make the top ten this summer for US Ladies. I am not sure how much she should be in the conversation. Then again if she got it... id sure as heck have a drink for her during her skate!