That doesn't look like far range, Princess..That looks like a Point Blank shotgun blast to the head, But this is actually really weird. I've heard of Crowning (Which is the Insta Kill Shotgun Blast to the witch's neck/back even though it's "Crowning"), Though I've never heard of a Shotgun Headshot Stun.

The commands were 'z_witch_personal_space 0' and 'z_witch_threat_normal_range 0', which made her unable to sense my presence so long as my flashlight was off.

Remember to vote the game up to Expert while attempting this. It is also handy to turn on invincibility, turn off the director, and kick the bots. Noclip isn't necessary, you simply have to headshot her from a farther distance (as pictured) than you would for the usual headshot crown.

My theory is that the crying Witch headshot stun mechanic is tied to a certain minimum damage required, something that only a few select guns can accomplish under normal circumstances.