They're pretty thorough about quarantine measures when they take the blood. They say it'll take two weeks to confirm immunity.
On the fourth day of quarantine, Marit Idasdattir has a dream. In her dream-domain, the same rocky clearing as always, a place of warm sunlight and gentle breezes.
A regal-looking reindeer, with fine clean fur of excellent gloss and color and horns as solid as oak, walks near her and bows.
"I haven't seen you in a while. Have you fared well?"
The reindeer opens its mouth as if speaking, but no sound can be heard.
"Oh, is that so?"
The reindeer nods.
"I suppose it was going to happen eventually... I'm not ready, you know. I'll never be."
"I know. I'm sorry."
The reindeer nuzzles her for a moment.
"How disappointingly mundane. A stroke. And just when something interesting was going to happen."
The antlers exaggerate the reindeer's gentle head-tilt.
Marit startles. "-What?!"
"Freyja guide me. Magecraft to restore youth."
"So I must ask her for a small token, shaped as a heart?"
Another slow nod.
"Why ask me to linger here? Not that I'm objecting. I always thought that if my time was up, I would be taken whether or not I am ready."
"...So you think she speaks truth. That there are yet more worlds beyond this one and the afterlife."
"Ah, thank you for the compliment. I shall do my best. Shall Odin send me guidance?"
A headshake from the reindeer this time.
"On my own judgement then. As you say, kjære. Goodbye, and thank you for visiting."
The reindeer runs away through the clearing, turning pale and translucent and then into a shapeless blue mist, and vanishes. Marit spends the rest of her dream in quiet contemplation.