A funny thing happened in our house the other day. I told Grace we needed to go change her diaper, she looked at me and then started off towards her room. I followed her and she walked right up to her changing table and waited for me to pick her up.
If I ask her if she wants to eat, she'll nod yes and head towards the kitchen. If she's thirsty, she will do her sign for milk and then hand me her sippy cup.
I can't tell you the exact date that it became obvious that she is truly communicating with us, it's been a gradual thing. But it's so amazing to watch!