Welcome to the club =)
I agree about checking into overexcitabilities. It was like the world made a little more sense when I realized there was such a thing.
I wouldn't worry just yet about the language, especially if she is doing so well with signing. She could be asynchronous like someone else suggested. My DD wasn't speaking at 2 but could read. He does have ASD but, it was also very apparent something was wrong besides lack of speech. It sounds like your daughter has no issues with receptive language which is a good thing! If you want to talk any more about concerns related to ASD, I'm more than happy to chat with you. =)
