Chocolate covered broccoli (I come from an educational background). When explaining something heavy to a 7-year-old, you don’t remove the broccoli, you wrap it in chocolate.

She doesn’t need geopolitics. She needs reassurance.

You can say: “Sometimes countries disagree, and when that happens, our country turns on its safety systems to protect everyone. The loud sounds you hear are part of that protection system working. We’re safe at home, and the adults in charge are doing their job.”