Careful. There is a huge difference between letting her cake eat while putting you in the friend zone and you being a jerk and ignoring her. It's not an easy balance, many of us struggle for months with it but you being cold/rude toward her isn't the DB path.

There is a way to act and it has nothing to do with how she acts toward you. Her being an [censored] to you does not give you the right to treat her the same way.

Accept what is, let go of what was, and have faith in what will be