Yes, complain. Of course, do it in a professional way, which it sounds like you will (I, too am accused of being too polite!).

I've been in this situation as well and I usually can catch their attention and tell them "I'm ready, at your convenience." That usually prompts a normal person to respond right away. Never have I had someone finish serving the entire cabin (they may finish the row they're on, which is understandable).

Anyway, her passive-aggressive attitude was uncalled for and must be reported.