It's a tough situation, and one without simple answers. But my advice:

-Talk alot. Make sure she knows what you like, why you like it, and how she might go about it. Encourage her; initiate, first of all -- welcome her home naked an kneeling, offering a crop for a few nights, and I'm sure things will move along -- and give her feedback -- what she did well and yes, what could be improved. Dominating is largely about confidence, and knowledge and feedback are the main ways to build that up.

-Be patient with her. She has her own hurdles to cross, topping isn't easy or instantly comfortable, it's harder to help push her past her limits, and a mistake from the top can be pretty disastrous. Remember she's learning too!

-Find out what she wants. Her idea of domination may not mirror yours -- she may not be pushing you simply because she doesn't want to do certain things. It's a hard situation when one partner has further extremes than the other, but at least knowing will give you a place to start working with it. Keep in mind she may never be your fantasy domme, any more than she's a supermodel!