I hope that I can calm your fears.
We started cruising with our 2 boys when they were 5 and 8....now the youngest is headed out on his 22nd cruise in May. (He is now 16)
We have experienced every age group on some 14 different ships (some ships multiple times) and have never had a bad Camp Carnival experience.
Since our youngest son has autism...I have a PhD in being overprotective. Camp Carnival staff have always gone above and beyond to alieve my fears.
You will also have a pager, so that they can contact you anywhere on the ship...should she need you.
I can only speak from lots of personal experience that she will be well cared for and you can have a great time!!