I believe she is kneeling down to show submission. Although she should still be a giant anyway so it still doesn't explain the Admiral's "Torpedo" in her face since she was potrayed practically a giant before.
From what I understand, loli Seaport is a fairy inside regular Seaport guarding the "camping grounds" or something, not sure about the proper military lingo of that term. This series has become one of the weirdest eroticas I've ever seen ._.
...yas...I'm the boss around here!Hey! Are you unable to understand the situation? You're just a garrison guard fairy... I'm the ADMIRAL!!Please do not casually barge into the barracks, alright!?Do you understand? Hmm? SPEAK!Admiral-dono! This is an important military zone...Seaport Princess's barracks IS my barracks!Base Interior of Seaport Princess, Barracks Gateway