What ID said.

Be polite, courteous and let her know that the two of you are not compatible.

Just because you love someone, doesn't mean that they are
right for you. Nor does it mean that a person will change for us. Part of a solid long term relationship is loving someone for who they are today.

If she isn't willing to open her mind, understand your needs or become the domme that you desire, then she isn't the one for you. You don't need to give her a huge explanation, if she hasn't figured it out by now, then there truly is a problem.

This isn't about blame, anger, etc. It's about two people who don't have the key things in common needed to succeed in the long run.

Take care of yourself.