And that single issue is so important to her above all the others, that just about any action he takes or speech he gives that's not related to The Wall is, in her eyes, an unnecessary distraction.
President Trump, nearly singlehandedly, has kicked more ass than any other president in history. He is fighting the democrats, the media, bunch of Republicans and he is still getting a ton done.
The Border as it exists could relatively easily be enforced by a heavy body count of enforcers from whatever gov’t agencies that can be brought to bear.
Then build the Wall to back off on the headcount.