Now, months later, it's just the norm for her to wave her arms in the air when she's "all done" and put her hands together and say "mo-mo" for "more." And we've added please and thank you, which she does if you ask her to, but not voluntarily. It's a start, though, right?
I just think it's so cool that even before her tongue can make the shapes of words, her brain can put things together and she's able to communicate. It makes it much easier to deal with her now, when she's so independent and wanting to do things herself. And it makes me feel better than I can teach her how to say please instead of her demanding things.