Perhaps I'm picking apart semantics here, but this statement causes me to raise an eyebrow and wonder. Like your wife, I also have a rather Dom personality in most of my interactions and while at work. I'm much more comfortable in a position of control, and tend to assume it naturally. I'd rather not change that. In fact, I'd have to wonder about my Dom's true intentions with me if he tried to adjust that aspect of who I am.
That being said, not all is lost.
It's the respect Master has for me and for my strengths as a person that cause me to respect Him in return, and trust Him, and desire to be submissive to Him. The men in my life that have been intimidated by, bothered by, or otherwise have desired to manipulate my personality are the ones that have always held the least sway over me. The subs I identify with the most are those of us that desire to give ourselves to someone that deserves us, so don't try to change your wife's personality, nurture it and prove to her that you're deserving of taking her as your submissive.