Bad move by Mirai. She has no chance of winning.
What's the point of appealing, anyway? What part of the rules would indicate that the selection committee erred? The standard isn't to show that she deserves it more than one of the people on the team, she has to show that the selection committee didn't follow its rules. I'm having a hard time seeing how she will be able to argue that.
The thing is, what is Mirai going to say, and who is she going to say it to?
"Dear selection committee: I think you should have sent me instead of Ashley."
"Dear Mirai: No, we think we did right by sending Ashley. Thanks for your interest in United States Figure Skating."