Hello! My daughter was 12 when diagnosed with Addisons. She is doing okay. She does get tired easily but I don't know if it is because of her weight gain and too tired to exercise or medicine levels or her mild sleep apnea. She was not a very active child previous to the diagnosis-but we don't know how long she was dealing with this and we didn't know.
I would suggest getting a calendar and devote the calendar to your daughter's symptoms (or have her do it since she is in college). Jot down the days she is tired and how tired she is. We have discovered that when she is VERY fatigued, usually that means she is sick or getting sick (which affects their cortisol level). Nausea, dizziness, stomach pain, and trembling usually indicates that she is not getting enough cortisol. We have had to increase her dosage occasionally. She takes fludrocortisone as well and is on .2 mg a day. This is high for a child of her age. Our endo also wants us to keep up with any symptoms that could indicate another auto-immune disorder. Since she has one, she is more likely to get another than someone without an auto-immune disorder.
I would suggest for her to keep Gatorade with her on hot days or when she is sweating to keep her electrolytes in check. My daughter uses the sugar free kind.
Make sure she has a medic alert bracelet or necklace since she is not with you all the time. They make really cute ones available on the internet.
Have her carry extra hydrocortisone in case she can't get home at her dosage time. We have found that earlier is better than later in dosing. Take it early as opposed to later. She needs cortisol more during active times than night time. We have the injectable cortisol for an emergency or Addisonian crisis but we have never had to use it or rush to the emergency room for Addison's.
I know my 15 yr old would be glad to answer any questions she may have.
We try to keep in mind that at least it is a disorder that is treatable by medicine. Some people have it a lot a worse than her. She may want to talk to a counselor (colleges usually have this available at the health center) or you may need to talk to someone. I internalized my stress for a long time until it was obvious I needed some help in dealing with this. Take care and we will keep you and your daughter in our prayers.
Let me know how you are doing.