The good thing is: she was diagnosed, and you know what to do to manage this disease. Also, your whole family will benefit, as you will probably all go on a gluten free diet, and people on gluten-free diets have healthier guts. As it was explained to me: gluten is like "glue" and it sticks to the cilia in the intestines that take in nutrients from your food. If the cilia are all gummed up with this glue, they can't work as well as they should, and you aren't getting all the benefit of the nutrients in your foods.
The bad thing is: we live in a world that bases its diet on wheat! Gluten is even added to foods that you might not realize has it. Depending on how sensitive your daughter is, you may have to be grinding your own flours to make your own gluten-free breads, and reading labels to see if the manufacturing plant of a particular product even uses wheat in the plant.
There are some wonderful cookbooks for gluten-free diets--you've probably already found them. Freshly-ground flours make delicious gluten-free breads. Health food stores carry gluten-free alternatives to wheat foods. Whenever your daughter is going out with others and there will be food served, you'll need to be sure she has gluten-free alternatives so she won't be tempted to eat what the others are eating. At age 7 she is old enough to understand the importance of doing this.
I'm sure it will seem difficult at first adjusting to this different diet, but once you get used to it, you'll wonder why everyone else is gumming up their intestines on a daily basis!
Best wishes.
J.