What are symptoms of diabetes/low iron or low blood sugar?

My daughter is 2 yrs old and has been shaking uncontrollably at daycare upon waking up from her afternoon nap. She eats healthy and the daycare checks for fever each time this happens. She is not cold either..there is no goosebumps. I don't know her fathers side of medical history and i'm just concerned this could be something more serious like signs of epilepsy or diabetes..anyone else have this occuring with there children?