She probably would have changed her clothes. Or been offered a change of clothes by the hospital. I can't imagine anyone allowing her to sit in a hospital waiting room in blood soaked clothes.

Oh, Derek isn't going to attack her. He's going to use his influence to make sure that no one in the underworld, no fence, no CI, no ex-con, is going to speak to her. She will be left completely high and dry on every case she's working, with no way to resolve them. If it wasn't for Jamie, that was. :D