Is she a young two or an older two? I think that it sounds normal.She has vocabulary and uses it appropriately - her articulation is the problem and that will come with age. My newly three year old is still very hard to understand, but she talks non-stop. The doctor wants to watch her but says tha tas long as 50% is understandable, we are still okay. We will be reevaluating when she is closer to 3 and a half. Kids ARE different. My older child spoke like an adult at 18 months - full sentences and very clear with a huge vocabulary. Keep a dialog open on tis issue with the doctor, but I wouldnt' worry too much. It if more of an issue if you feel it is impeding her social interactions.