Her ALO not responding, will have no affect on her application. As a Junior, she doesn't even have an application. For all you know, she may not even have the same ALO next year. As I said, most are volunteers. They sometimes change out schools that they cover.
Whatever, don't read into it too much. She'll be fine in the application process. My advice as for classes and such, the most important thing she should be doing and taking in high school, are the things she likes. The classes she'll enjoy most and have fun with. I always ask applicants with similar questions; "If you weren't applying to the academy, would you still be in JrROTC, or CAP, or Scouts, or Band, or whatever the question is referring to. If the answer is YES, then she should be taking that class or doing that activity. If the answer is no, then she shouldn't be doing that activity.
Don't try to 2nd guess applying to the academy or ANY university. An individual who is passionate about band and music, will have more success, more leadership opportunities, and a better resume/application for the academy or any university, if they stick with that; than to change to an activity they think is a "Better" move to look good on the application. I've seen a lot of Uber smart 4.0 type students not receive an appointment, because that's all they had. They had no activities. They didn't have sports. They didn't have leadership. They didn't have volunteer time. They didn't have team activities. But by God, they had their 4.0gpa, 35ACT. They thought they should get a full ride to any school in the country they wanted. Well, even Harvard, Georgetown, Purdue, and any other decent university wants to see a diverse student with community involvement, leadership, sports, clubs, and other extra curricular activities.
So definitely take the hardest classes that you can succeed in. But make sure she is enjoying her life. Nothing, not even the academy, is worth it if you're not happy at what you're doing and who you are. Get her to come to the forum and ask questions. She'll do fine. Take care. Mike.