Whatever happens, keep in mind that she can't just become dominant, before I discovered my dominant side it took alot of switching to find myself comfortable in the role that I desired. Tell her to do what she wants to make herself comfortable with you, remember she would be the one in control, not what turns you on if you truly want her to dominate you. Show her that you want to please her, try to think of way you could satisfy her.

My other suggestion is tell her what you desire subtly, accept it if she says no.