Hi,
I am no expert, but I am not a fan of the Cogat. I have found that it scores low. I would pursue individual IQ testing with a school psychologist.
Our children are similar, my DD5 is reading at about a 2nd grade level and she is changing and learning fast every day. The crazy thing is that we are sending her to K, it is a half day program with a second language component. I bet we last 3 months, but we will try it since her pre-K friends are there and she wants to try to be with them.