First of all... she is going to have the time of her life!
This post brought back such memories. Our Dd was just dx with type 1 for 6 months when we las went to disney in 2010 (going this summer again which is why we are back).
I didn't find her blood sugar went too out of wack and she certainly was able to have more treats because of the excercise. The one problem we found was she didn't like the rollercoasters like she did before, because the "drops" made her feel like she was going low..

I am hoping she will know the difference this year and will be back to her old adventurous self.
Also, because she was relatively new to injections we often went to first aid for her injections. They began to know us, ushered us into a private room and there were even sharp containers for the disposal. This was often faster than the long line ups in the washrooms, and much more sanitary!
Definitely get a frio! I am now going to tell you our "horror" story.

I can laugh now.. but it wasn't funny at the time.
I kept our extra insulin in the hotel fridge. On the 3rd day the fridge malfunctioned and froze ALL the insulin. All she had left was what was in her pens.
To make a long story short, I contacted the pharmasists and they would only give us NPH over counter but not humalog, without a doctors prescription. That was going to cost big bucks! They wouldn't take my doctors prescription (We are Canadian).
I posted our predicament, on the CWD (children with diabetes) board. The members there got me in contact with a wonderful woman in Anaheim whose daughter used the same insulin. She delivered the humulog we needed for the rest of our trip.
So the moral of the story is DO NOT TRUST hotel fridges....