"lovebug" is right. If she never went to kindergarten,

there should be no problem for her to get into kindergarten now. (Lots of people do delay their kids for one year.) [Why did you send her to kindergarten if you do not want her to go to 1st grade on the following year?]

Now, unless her kindergarten teacher "testify" or you find specialist to testify that your daughter is not ready for 1st grade, she has to go to 1st grade.

I just realized Connecticut cut off date is Jan.1, so, in theory, 1/3 students will go to 1st grade before 6th birthday. From your post, seems your D B-Day is around Oct., she is not really the youngest in the classroom.

Co ask the question: what makes you think your daughter is not ready? (I personally think teacher/education expert knows more on how well a kid can do in a classroom setting.)