Puff is missing a small piece of his tail from other dragons biting it off before I got him.
She sounds good, its pretty typical for Dragons to bite the toes and tails of other dragons if there is no other food. As long as she has a good fat deposit in her tail she should be pretty healthy. Thats a great size cage, don't forget the different lighting he will need and Dragons love to climb. Puff will actually jump up into his different branchs.
Once a bearded dragon becomes an adult veggies should be a big part of their diet. They love variety and color, I use Kale, Radicho, Carrots, Peas, Mustard Greens, Collard Greens, Spinach, etc. Puff gets his bowl of salad first then later in the day he gets his insects. Right now he is eating superworms because they contain more water then crickets which he needs now with his kidney problems. I will be putting him back on crickets this week though, I prefer them over the worms. Puff actually likes the freeze dried crickets better then the live ones. I may start him on pinkie mice soon too, they are better for them to eat. Dead ones though, I don't think I could watch him eat live ones. Don't forget to tell your nephew to get a calcium and vitamin powder to sprinkle on the food.
Hope this helps!!!