Yes, I know, but I can’t tell my mother anything. I need proof. lol
She would have needed to have served a minimum of 2 years 9 months to earn that rank, according to Born to Conserve’s link. That’s a bit much for a 14 year old.
OTOH, I can easily see her having the portrait taken to honor some young swain by proudly wearing his uniform for the sitting.
Young girls being what they are, and young sailors being what they are.
Especially during war time...