The advice commonly given on how to keep your cat calm during fireworks displays is well known, and is very good advice: keep her indoors in a dark room, play music to block the noise, keep the music calm and soothing, don’t comfort your cat (makes her feel there is something to worry about), block all cat flaps (she might run away), and provide a litter tray indoors.
There are a couple of different ways of giving a pill to your cat, and which one you choose will depend on nothing but your personal preference.
If your cat suffers a fractured bone, it will almost certainly have been caused by physical trauma such as a fall, car accident, animal attack or cruelty. In some cases fractures can be caused by normal activity such as jumping, or running. If so, your cat will most likely have some underlying medical condition that has weakened her bones, and that needs investigating by a vet.