I have no experience with diabetes, but my son has food allergies, so I can give a bit of helpful advice. In addition to communicating with the school nurse and front office staff about daily needs, plan to talk to your daughter's teacher and room mom about classroom parties and special events. Make sure they communicate with you in advance regarding the menu and any special treats. In both kindergarten and first grade, my son's teacher and/or room mom got in touch with me before Thanksgiving, the holiday party, Valentine's Day and the end of the year party to tell me exactly what was on the menu. This allowed me to either approve the food that everyone else was eating or send a replacement treat/meal that my son could have. He really likes to be able to eat the same type of thing as everyone else (such as dairy-free pizza when the class has a pizza party), even if he can't eat the actual item that everyone else has. Hopefully you will be able to either calculate the classroom food into your daughter's daily allowances or send her with comparable food/treats so she can enjoy the parties too.
Moving beyond school, have a similar philosophy if she plays on any sports teams. My son plays soccer and baseball, and I always tell the other parents on the team to notify me in advance if they're planning to bring treats for a birthday or something. That way, my son always has something to celebrate with and doesn't feel left out when everyone else gets cupcakes and he doesn't.
Lastly, to the extent that you can, have an ongoing agreement with your daughter that she can have something special if there is an unexpected celebration that you can't plan for and she ends up being left out. With my son, I always let him have a special dessert at home if we find ourselves in a situation where everyone else is getting cookies/cake/ice cream/whatever that he can't have (I always have allergy-friendly treats in the freezer). If a food substitution isn't feasible with diabetes, have other special options available to her, like extra books before bed or a movie night.
Anyway, I hope I didn't veer too far from your actual question. While I don't know anything about diabetes, I do know how tough it can be when your child can't eat the same food as everyone around her. I hope you're able to work it all out and feel like she is getting the care and attention she needs.