This is easily some hilariously sexy misunderstanding on Graf's part. And any good Admiral would be quick to rectify that misunderstanding.

... too bad I'm not a good Admiral.

Supposedly its a reference to her 5am line: マルゴーマルマル。もう朝だな、Admiral. シャワーでも浴びてきたらどうだ。ここの執務は私がサポートしておこう。
0500. It's already morning, Admiral. Why don't you go ahead and take a shower. I will support you with the work here.
I guess she imagined that ttk would ask for a closer help.