I know that I asked too many questions, but the life events taking place are changing and exposing us to newer things. And each one brings new challenges and new opportunities.
Again, no relevance here. All of your daughter’s life changes and opportunities should be made known to her CC if she hasn’t done this already. This forum cannot give you the specific advice you seem to need as you keep alluding to how special and different her situation is. I can assure you that her boarding school is quite experienced at guiding and advising students of all levels of accomplishment and need and will not be stymied by her situation. Her situation may be new to you; it is not new to the school. That breadth of experience is part of what you get with these schools.
Make sure she is communicating effectively with her CC and make sure you have a line of communication to the CC as well as that person is your best resource. A question like which students are eligible to attend college fairs is a very elementary question that your daughter probably already knows the answer to, but is quickly answered by the school itself. If reps have been invited to campus, the school has advertised this fact to the student community along with time, place, and who should attend. Pretty sure your daughter has this information.
"Make sure she is communicating effectively with her CC and make sure you have a line of communication to the CC as well as that person is your best resource. "
Agree with @ChoatieMom’s comments above. I will add, however, that the college counseling office is super busy this time of year on helping the seniors in getting their lists squared away, applications out, and writing the counselor reports for each of their seniors. With ED/EA applications going on now, then RD apps, they are very busy between now and January 1st. Then, at most schools, the bulk of their attention will shift to juniors.
Your daughter (and you) should be using resources available. I have no doubts that info is up on the school’s website, that emails are being sent to your daughter regarding the college fair. She can also use her advisor and current seniors as resources. If she still has questions, as I mentioned before, forging a good relationship with the administrative support is a good idea and that person will know the answers to who should attend college fairs and what colleges will be represented.
As much as boarding schools will help with the college process vs. say public schools, they aren’t going to spoon feed you along the way. Once your daughter has the list of represented colleges in hand, it is upon her to spend a little time looking at the list and researching those schools to see which ones might be worth further consideration based on her academic areas of interest and other considerations such as fit and affordability.