My 6 year old granddaughter was diagnosed with Type 1 diabetes in April of this year.  She is constantly complaining about her stomach hurting.  She is just starting to recognize when she is low.  She is constantly down to the school office with a stomach ache, dizzy, her legs, arms hurt her.  Most of the time we have her blood in the normal range.  They just called from the school and her blood is in the normal range but her tummy, legs, and head hurts.
Hello blood sugar is well controlled and is within the normal range, these symptoms can be due to some other cause and not related to diabetes. The treatment of diabetes is injectable insulin. The Units may vary according to blood glucose, but other than insulin there is no other choice. The child should be educated about the symptoms of hypoglycemia like dizziness, sweating or anxiety. There must be something(containing sugar)with the baby always and whenever she feels these symptoms, she should have that. The low vitamin D land calcium level can cause generalized body ache. I would suggest you to get her evaluated by a pediatrician to find out the cause and any investigation if needed should be done. Regards