How do you say no to an escort you don’t like

I had an outcall come over last night. She looked much uglier than in the pictures, she had a horrible stench of cigarettes and she clearly hadn’t showered, taking a good look at her you could tell she was also a junkie. I almost felt like puking the entire time from the smell. I’m a wuss and I didn’t know how to tell her to just leave so I did just a blow and go. How do you go about telling her to leave? I’m afraid they get mad and threatening, after all they would know where I live