GT denial is very normal and while I'm finally getting better with DD9, I have a severe case with DS3. They are so different and that's what makes it so hard. While DD was an early talker, DS is not, but has had a hearing loss diagnosis. Today DS typed various words on my laptop and the read them to me. I knew he recognized his name, but didn't know he types and reads other words as well.
Also DD9 was identified at school but no services were provided because she didn't fit the teacher's ideal "gifted child" mold. I think girls are sometimes overlooked for math giftedness and at least DD refused to do work that didn't seem meaningful to her. She began talking and interrupting in class.
Also, her teacher called me because she was shouting out names of animals during a rain forest video the class was watching. The teacher thought this behavior wasn't worth "rewarding" by sending her to gifted math and LA. If a teacher doubts a child's GT status, what do I know, KWIM?
I would suggest looking at all options for education. We decided to move to a GT friendly school district and it has been so much better.
Jen