What the fuck is Justice Jackson doing ?
Here's one analysis:
Jackson gets this application because it's from the 1st circuit, and she is assigned to initially handle all shadow docket matters from the 1st circuit. By writing this admin stay, she potentially keeps the full court from stepping in and doing it for her. And this way she gets to set the 48 hour limit. This could cause the whole case to be decided one way or another a lot faster.
The supreme court let the trans passport case sit on the shadow "emergency" docket for 48 days. This stay gives the 1st circuit approx the weekend to make their decision, then the 48 hour deadline puts some oomph on the rest of scotus to make their decision.
If Justice Jackson did nothing, and 5 votes on the court intervened to issue a stay at 1 am, then there would be no 48 hour limit.