Here's the thing. Full search and arrest warrants in compliance with the 4th Amendment are signed by a judge/magistrate on a showing of probable cause that a crime was committed (both types of warrant), and for search what premises are to be searched, for what type of evidence, and how the premises and evidence are connected to the crime. Both include the ability to enter personal property for the search or arrest.
Administrative warrants are for less-than-criminal proceedings, of which immigration is one. The 4th Amendment doesn't apply to non-criminal proceedings, per se. They do authorize officers to make arrests in public places, but in a nod to the 4th Amendment, don't permit entry on private property without consent.
They're not the same as a criminal search or arrest warrant. But then again they have no application in criminal matters. And immigration is not a criminal matter in most cases.
But yeah, since they cant' come on private property, you can tell them to fuck off if they knock on your door.
The lawfare article I cited goes through the case law that state officials have no duty to assist federal officials and that extends so far that states can make laws forbidding state officials from cooperating or assisting.
Ironically, Dugan is charged with 18 USC 1505, the Trump 1/6 statute, which the Supreme Court ruled pretty much applies only to documentary/evidentiary obstruction, narrowing the case against Trump, and making it non-viable against Dugan. The other statute is harboring a fugitive, which probably means something more overt than what she did.
She probably would have been better off to order the agents not to come in her courtroom. Ultimately what she did didn't hamper his arrest much.