My 85 Y/o Mother Fell And Went To Hospital, Got

My 85 y/o mother fell and went to hospital, got 2 stiches in her head and was given a cat scan which showed nothing wrong. The next day she started having sharp pains when she tried to take a deep breath or if she raises up or down. Seems like there may be fluid or air pressing against something or a nerve. There is no pain when you press on her chest or back. Pain is in center upper chest.