Teenages ugh!!!! It's a stage,Mom. It's scary and frustrating. While younger, you really had more control of her diabetes and now she is sick of it and everyone else running her life. It's time to rebel. Take a deep breath, stand back, watch for signs. If she looks or acts low or high then you may have to insist on she check her sugars and correct. Look into literature written by other teenage diabetics. Mostly, you will have to let her figure it out. you will not be there to manage it forever.