What is it that you want to change, that's what I would be asking myself, because you mentioned "I am not quick to judge people because I feel that people can change." and "I believe that people can change", and "makes it really really hard for them to change.."

So what would you want to change about her? Are you uncomfortable with the fact that she's a call girl? Is this something she would want to change? And... why not find someone you do not want to change?