A friend of mines little boy had issues with his speech. It was like he could understand everything but he couldn't get any words out. She was worried that he wasn't talking by the age of 2 and he ended up being diagnosed with Apraxia. Not sure if that could be a reason for your DD and the no talking thing....but if I was you I'd get some more opinions.

It's a shame your DH isn't supporting you and your concerns. Mummy intuition is pretty good, so if you don't feel right....just follow your heart.