Perhaps it's because she has the vessel history of being a flotilla leader, but in any case, Amazon acts like a veteran, and has a wanton need to lead others as Royal Navy's young instructor. She lacks height, and is often mistaken for being younger than she is, which riles her up quite easily. On the other hand, she has the humility to apologize when she is in the wrong, and has the capacity to accept apologies too. She joins the Joint Military Exercise to offer support, and to keep watch over the participants.
Nagato seems down on herself. Amazon notices this, and goes in to offer her advice as an instructor.