I am a professional photographer and I own two Sony DSLRs and 4 lens of various sizes. I have a two week trip to WDW planned in Feb and it will be my first time there. I am really excited about photographing WDW. So which camera am I going to take and which lens? None of the above. I am going to buy a camera especially for the trip.
The reasons are many. With a DSLR you are restricted to using one lens at a time. If you wish you can carry more lenses, but I don't change lenses in the field, to dangerous. I don't want to cart a few lens around along with the camera. When I am on any ride with water the camera will have to be put away and not used. When I am on any ride with a lot of motion I will have to put it away and not use it. Using your camera at an amusement park greatly increases the risk of damage, loss or theft. And it is a pain keeping a DSLR no matter where you put it. They are not exactly small.
My plan is to buy a (relatively) inexpensive point and shoot that is waterproof, shock resistant, and freeze proof. It will be small enough to fit into my pocket and be out of the way. It will allow me to shoot photos on just about any ride in the park. I won't have to worry about it getting wet or dirty. And if it gets lost stolen or broken I won't be out very much money.
The P&S will not have as good of image quality as a DSLR, however if you are not printing billboards and only looking at the images on a computer monitor 99% of the people will not be able to see a quality difference.
And if something does happen to the P&S then my DSLRs are backups. If something happens to your daughters DSLR does she have a backup?
You can get P&S cameras like I am describing starting around $100. I have decided on a Canon D20:
http://www.amazon.com/Canon-PowerSh...1352682017&sr=8-10&keywords=underwater+camera