My Daughter Hurt Her Bum We Took Her To Er

My daughter hurt her bum we took her to Er and got ex rays they said it was bruised and swollen. The next day she was in shower and it popped so loud I could hear it " I was in the bathroom with her but still that's not right is it? It pops all the time now and still not any better and this has been going on for a week almost! Do I take her to a chiropractor or What should I do she can't sit down and is missing school??