The International Maritime Signal Flag she's holding is 'Zulu' which has the meaning "I require a tug(boat)". Maybe she wants you to carry her or give her a hug. According to her expression it seems to be some sort of sign of endearment at least.

Source: https://en.wikipedia.org/wiki/International_maritime_signal_flags

However, the Zulu flag was used by the Imperial Japanese Navy to also mean "The Empire's fate depends on the result of this battle, let every man do his utmost duty". So, she might have another meaning in mind entirely...

Source: https://en.wikipedia.org/wiki/Z_flag

She's just collecting the flags from the children lunch set Admiral treat her to.