Brie has:
-started to say "thank you" unprompted.
-begun undressing and dressing herself, with much more success in the former area than the latter.

She also (and it was Dr. A. who pointed this out to me) sounds like Boo from Monsters, Inc., with a semi-constant, almost-comprehensible chatter - the sort you strain to understand, because it's ALMOST English, but not quite.