I have a son who communicated verbally but I couldn't understand him - 3 & 1/2 years of speech and he speaks beautifully. The "R" sound and t/th/ch were the last sounds that he mastered. He has a sister, who is three years older who had wonderful communication skills. They were impressive! However, what my son lacked in communication skills, he mastered in "small and large motor skills". He rode a bicycle at 2 1/2 years without training wheels and he would take things apart, with dad's tools, and reassemble them at 3 years of age. Really - the sounds will come. I learned not to make a big deal of them because I never wanted him to stop trying to communicate - which is what could happen if you continually try to correct a consonant sound. I have always made sure that my pronunciation was correct and many times we would play word games, especially while driving ...."How many animals/foods/etc... do you know that begin with the .... sound?" (truly, there were sooooo many we worked on!" The consonant sound that was worked on in speech was the game that we played, sometimes for a few weeks. We played a lot of word games. I never wanted to stifle him. He communicates so wonderfully, now. He's a good story teller at 10 years old. If you do feel that your daughter should be tested, check with your local school district for preschool testing - my son was tested at 3 years old and qualified for their program. He attended speech class in our school district. Good luck to you.