OK, I can share that girls WILL get their hair cut on I-Day no matter what the length is. It's all part of the 'shock and awe' of moving through those hallowed doors of Alumni hall as civilians and coming out as a member of the US Navy by the end of the day. So it's not a question of 'whether' a female Plebe can have long hair. SHE CAN'T.
That said - lots of people suggested last year and we did this and found it workable that your daughter can make this a positive moment there at home before I-day by going to a local parlor - sharing that she needs it cut for Induction Day and offering to donate her hair to Locks of Love. When my daughter did that last year they not only refused to charge her for her haircut, but mailed her long hair braid themselves, saving us the trouble. I am not suggesting every hair salon will do this, but it was definitely an upbeat positive experience for my daughter.
NOw, come I-Day even with her perfectly trimmed-to-specs hair cut- she still had to sit in the barber chair on I-day. However, I will let you in on a little secret. As Janell was getting her hair trimmed the woman barber whispered in her ear: