Many great advises here! What is true and consistent is that your 4/C Fall semester is very challenging because you start at the bottom of the barrel and you have much to learn, adapt (including the altitude), and there's non stop daily catch up. On top of that, academic standard has increased 2 fold as well as the lack of academic flexibility in choosing classes and professors, let alone friends.
As part of the solution, I do agree that Mom and Dad do less calls with your DD. Less Mom time and more Wing time. In fact, cut it down to one or couple of calls a week, reserved on weekends. Your DD should lean on the resources at the Academy and with sponsored family, and there should be many.
Part of the solution is for her to engage and discover what resources are available to her. Truth is, Cadets will always find things to be unhappy through 1/C. Over time, you will get less episodes and drama as her life and priorities change at the Academy. But many same dislikes can remain unchanged throughout her Cadet years. But her tolerance will change as she matures, becomes more proficient in her Cadet skills, culturally adapting, becomes academically more confident, and has found her tribe in a tribe.
It would be most unfortunate to quit and then realize that what she has left is better than what she has got her self into. An unstructured path in the CIV world is more painful than a structured path in a military career. You have to fight even harder and show a greater competitive advantage and differentiation in the CIV world to be recognized and to get hired.
On the contrary, at the Academy, Air Force wants you to be like everyone else, in speech, dress, presence, core knowledge, competence, confidence, physical and mental readiness, and allegiance. The beauty of being at the Academy and in ROTC programs is that at least you know what you will do for the first 5 years after commissioning. Not the case in the CIV world. No one will be there for you if you are not there to take care of yourself. What Mom and Dad can do for DD is limited as it is the case now. There is no structured institution to guide you. You must lead yourself. Unless, your DD is mature enough to manage herself and make important decisions, she can be in a more challenging environment outside the Academy. At least from what I can read from your post, I do not think her maturity and self reliance is at her best. If she was at a CIV college, I would like to recommend a Gap Year so she can grow up a year, maybe. But not at USAFA because you grow up by being part of the tribe, not away from it.
So it can be a rude awakening for your DD to leave such a privileged environment the Air Force can give her. USAFA may not be the best place to be now at age 17-19, but it is a great place to come from throughout your lifetime!
We hope your DD will eventually beat her current challenges and emerge as a talented young warrior she is meant to be and one day protect our Allies and our Nation's skies!