Hello,
For the personal statement one, she needs to tell Admissions something they don't know about her already. She can make sure she doesn't list any of her achievements that she already checked off in the Candidate Activities part of the application. She may not have a story, but have her think of what she is lacking. USNA admission is largely based on Academic, Physical Fitness, and Leadership. Some more some less, but those are the main three. IF your DD is weaker in one of those areas, have the Personal statement be about what she's lacking and how she's fixing it. Not as direct as that, but for example, for me, Physical Fitness is my Achilles's heel. So I talked about what I've been doing physically (stuff like JROTC P.T. , working out with Marines, stuff like that) and how that has helped me. My whole personal statement wasn't about that, but I really talked up my physical fitness there, because that was something that wasn't fully apparent. It's a really great way to tell Admissions something they might not know or want to know. If your daughter is a really great student/athlete/leader, and has no main drawbacks, then she can write her statement largely about her commitment to the Academy/military in general.
The Personal Statement can't "break it" for someone, but they can surely help someone "make it". If there's something Admissions HAS to hear, you have 500 words to have her tell them. I wish her the best, and good luck, and I hope
This was a huge help! Thank you!