Well, I originally wrote a couple of paragraphs about exactly that perspective. However, I became too emotional, so I decided to change my message to "Just do your best."
Finding out whether the person is applying for himself or because of his parents is probably the main reason Blue and Gold Officer interviews exist. I will take a reasonable guess that the academy finds that students who go in under parental pressure are much less likely to finish the academy. A candidate's reason for joining probably correlates closest to whether or not he or she graduates from the academy, but that is just a guess as well.
Another main point of the interview is for you to judge whether the candidate has the look and sound of Officer material. I would not be surprised if some people are not squared away when they show up for the interview, or come late. The Naval Academy would like to know your judgement and opinion of the candidate's motivation level and also his/her aptitude to be a leader in the Navy further on.
The academies find that 15-20% of the students in each class lack the desire or ability to graduate. Without quality interviews and psychological questions, the statistic would be higher. Since the Academy needs your guidance, it is possible that many parents DO push their kids, and that some students who apply have no business in being an officer, or both, so you probably will see those students once in a while.
The funny part about being a BGO is that there is a chance that you could write a glowing review of a candidate, only to find that the candidate was rejected. In other words, there might be many candidates who you are glad are considering the Navy, who you think, in the back of your mind, will make it, but won't. If I was a BGO, I would try to prepare myself for this situation ahead of time, because it is one that would otherwise make me feel that the achievements of my candidate and my own efforts as a BGO have been ignored. I would try to remember that if a candidate who I thought should get in doesn't, that this happened because the candidate wasn't right for the Academy as far as admissions could see, not because you did anything wrong.
From what I have heard, BGO reviews will probably not affect a candidate's chances, unless they are really positive/special ones. What they might do is give the academy a reason to remove that candidate from consideration, however, which is something they probably hope for since they have 15,000 applications to process. This, of course, makes sense. But, don't worry about anything and just write an honest review of the candidate. If you think they are very special, write that. If you think they are excellent, write that. If you think they will make example officers, write that. If you think they will make a motivated midshipman, write that. Write whatever you think, and don't look back. I don't think a BGO could possibly 'screw everything up.'
So, just do your best. Good luck!
she is fine! I liked the part about dental modifications. Oh brother. 
