I think you'll find that one day she'll erupt with sentances. Matilda did... suddenly after 2 months of exactly what you are describing she started saying 3 words together. She still has days where she will point & not find the word & get very frustrated, but nothing like the frustration she had over words when she was 2.

I just would ask her "what do you want?" if I knew & understood I would say "ah! you want xxxx, let me go & get xxxx for you Matilda" I heard someone else on BB do this with their child & it made sense to me to just use the word she was working on heaps, and when DH got home I would say "Matilda had xxxx today" or something like that to get her used to hearing it said out loud a lot. I started talking heaps about everything we were doing and what we were using and how it was used etc etc... I got tired of hearing my own voice, but it suddenly clicked for her & her vocab took off. And she goes through vocabulary spurts where she will suddenly improve over 2 weeks and then stay there for a while...