"They just might."
Their conversation winds down soon after that. The remainder of quarantine is still fairly boring, but they'll get Thorn a few more books or board games if she asks. Marit tells scattered stories of her friends and family and travels and solicits the same. Marit carefully scribes about two dozen seals, then stops, saying any more would just be pointlessly subtle variations on ones she's already covered.
They do indeed make Marit wait out the full four weeks of quarantine - she complains about it enough to get the Captain of the military base to come visit in his own biohazard suit; They have a shouting match that shakes out to 'the actual Danish, Swedish, and Norwegian parliaments all said four weeks but I can get you some more money'.
Eighteen days into quarantine, a nurse informs Thorn that her blood test came back as 'immune'. She's not a citizen of any of the five nations which makes the paperwork a bit confusing but they've made an ID card that says "Nationality: N/A" which will confuse bureaucrats but is better than nothing.
Twenty two days into quarantine, a letter from a newspaper journalist arrives with lots of poorly informed questions for her and a request to meet him when the quarantine ends.
And then the quarantine is over and the nurses let them both out.