I forgot to mention: Maia can count! Sort of. It goes like this: "One, two, pee, pour, tick, eighteen, aheven."
And, tonight she went in the potty! Chloë's seat on the toilet, to be exact. She was having constipation issues, and after changing two diapers (one bloody, poor kid) I noticed her starting to strain again and suggested she try on the potty seat. She likes it, so she agreed, and after a moment we heard a tinkling noise. I started in on the joyous praise, and Chloë, like the good sport she is, added her own "I'm toe proud of you, Maia!" and kisses. Maia beamed and said, "Again!" and tinkled a little more, and we duly repeated ourselves as she laughed in delight. Then she strained and produced a poop, and we went wild. She got three stickers and two mint M&Ms (I went a little overboard), and was wholly delighted with herself, saying "Yay Maia!" and clapping. I was delighted too with our big girl. This augurs well for the coming year.