She could be going through a growth spurt. Lots of growth hormone released at night. I've noticed this with my adolescent son who is growing like a weed. Also, there is the dawn phenomenon to consider. I have always worried about what my son's BG is doing at night - he was diagnosed 6 years ago. I have to say our Dexcom G4 CGM is wonderful and has made life a bit less stressful and allowed for a more peaceful night's sleep. The CGM's transmission range is strong enough that I can keep the receiver on my nightstand while he is sleeping in his bedroom. The alarm wakes me up (unfortunately, it doesn't wake my son up even when it's right next to his bed -- he's a very heavy sleeper) if his BG goes out of range -- we then can do a correction or treat a low BG before things get too out of control. Might be something to consider if your health insurance covers it.
There are so many variables - Placement of pump, stress, growth etc... My daughter is the same age and has been diabetic for 3 years - the only thing we find that helps us is consistency - routine - and we still have swings in BG - but 85% pretty predictable. We do the same basic snack every night - Goat Milk and graham cracker and it seems to satisfy her and we have found it to be predictable for her morning BG. We are considering the CGM to really dial in her BG - last Endo appt A1c climbed to 6.8. its a daily challenge - I have found great knowledge and advice in "Think Like A Pancreas" and both of Dr. Bernstein's books - just cant remember the names of his. Good luck and God bless.
Definitely could not cope at night without the CGM. Just when we think we have it figured out something changes. His schedule, activity level, growing, fighting a cold . . .I can sleep with the CGM on my nightstand for the immediate purpose of catching highs and lows but more importantly we can use it to analyze the trends (sometimes you can actually see when the real problem is) Sometimes highs in the morning can even be caused by lows in the middle of the night and the body's ability to rebound from them.