Let it go. If she has lived with it this long and says it looks fine, then she has already decided this is not a problem she cares about. Nobody is tripping over cords behind a console, and a lamp cord near a power strip is not going to burn the place down unless something is frayed or overloaded. You already gave her the cheap fix, so the ball is in her court. Pushing harder just makes you the guy who complains about other people's houses. Save your energy for stuff that actually matters, like if she asks you to help move that console someday.