After memorizing all she could from Felix's Sony Xperia Z18 tablet, Bearded Bad Person Sylvester goes at Maeve again by telling her the "things she needs to change are burned in her core code so deep no one could touch them." And this leads to a crucial revelation.
"Parts of me are quite old," Maeve says, almost talking to herself. "There are some elegant formal structures, kind of re-casted beauty, but complex -- like two minds arguing with each other. There are things in me, things I was designed to do, that are just out of my reach. They just seem to be dormant." She pauses, then asks: "Who is Arnold?"
This bit of dialogue essentially speaks to the entire thesis of this show: that it truly is a contest between the dueling philosophies of Ford and Arnold. The "two minds arguing with each other" seems to be literal parts of Maeve that were built or rebuilt by each man. Because Arnold ultimately believed that robots a) are better than humans, and b) should eventually live free, he has buried code in her that -- when unlocked -- gives her all the tools she'd need to get the revolution party started and become our first robot madam overlord.