As far as I know age of onset for bipolar disorder isnt until mid teens - early 20s. Diagnostically speaking youre counselor at school probably had no clue you would be eventually diagnosed with bipolar disorder. You were probably exhibiting some symptoms that were abnormal and depending when exactly it was that you this young age diagnostics and treatment were probably very different to a point that disorders had completely different names.
If I was in your position I wouldn't worry or dwell too much on this. As someone with an equally irresponsible mother I know that it can be incredibly frustrating knowing someone told your mom to get you help and her lack of action could have in fact resulted in how extreme the symptoms are that you experience now.
Lastly, when I was in second grade I used to skip out and go to the counselor too. He had nifty toys and he was always happy to see me. It was a lot more fun then my classwork. I am sure since my parents were divorced and I was living with my exhibitionist artist grandmother and a mother who had the emotional maturity of a 14 year old and her own set of Anxiety and Mood disorders I was probably severely emotionally disturbed as well. While yes I am diagnoses bipolar 2 I am extremely high functioning and I love my life! Everyone is different.