Leadership is about going to the source of the issue and directly setting the expectations. As an executive leader in a crisis like this border surge you should be very visible, very communicative, and clearly setting pace & direction. Harris, as a leader, needs to be at the border to rally the staff working the situation at the check points and holding facilities, as well as enforcing clear messaging to those who cross the border illegally. Make it clear that this is a problem that America is addressing.
And I will note that Trump did not handle it well either.
Most people don't give a shit about Harris going to the border for a photo opp