Great pictures!
I am certainly not an expert, but since I am now using my third different underwater camera while scuba diving, let me offer a few tips:
1. Get close to what you are taking the picture of. As a matter of fact, once you are as close as you think you should be, get just a little closer.
2. Make sure you have a good light source. While you "can" get good underwater pictures without a good strobe, it is much harder.
3. Practice, practice, practice. Living in Colorado, I don't get much of a chance to go diving, but I try to take as many pictures as I can when I do. Taking pictures underwater is a lot harder than taking pictures above water, so keep trying.
4. Have fun!
Sorry, not trying to hijack the thread. Please have your daughter send more great pictures.