What does Angela Rossi do when she first meets Elvis? Why does she react that way?

Angela Rossi stops Elvis with her partner and asks him some questions. Without warning, she hits him. Not knowing he is a private investigator, Rossi yells that Cole has come to her home and her partner, Detective Tomsic tells Cole that he is being investigating for stalking a police officer. Cole tells the officers that he is a private investigator, looking into a claim that Rossi is living beyond her means. Once Cole is identified, Rossi calms down, especially after Elvis tells her believes she is innocent of the accusations against her. She then tells him that if he comes near her children, that she will kill him.