I'll second Angie's advice. They might not be able to help yet (our ds had just turned 3 when we had him evaluated and was the youngest in the system), but they will be able to direct you to who can. Early Intervention can also do an evaluation. At this point in time I wouldn't worry about IQ. From what you've said, she does have some receptive language skills and that's a big plus.
Expressive language skills come later in some kids, some kids just need a bit of help, etc. The school system or EI will be able to guide you in the right direction.
Today is a new day and a good day to start anew.