The trigger is different in case of different teenage girls. Once the process starts, the body stops producing insulin and thus our body gets more susceptible to infections that begin to attack the pancreas. Signs and symptoms of Type 1 diabetes in Teenage Girls: In case of type 1 diabetes, there is a rise in blood glucose level. Generally it to 5 to 10 times higher than the normal level. The excess glucose gets mixed with the urine which in turn leads to frequent urination and dehydration.