I had thought of that and would add the following.
She is in Germany so they would need to marry and then he would need to move to Germany.
Norway, Iceland and Liechtenstein are equal partners in the internal market, on the same terms as the EU member states. This includes having access to the internal market's four freedoms, the free movement of goods, persons, services and capital. I do not know her skill set or when her time in Germany is up.
She could of course move to Norway, now I have no idea about how long that would take, probably much quicker than a spouse moving to the US.
She is an AuPair, not sure how easy it would be to get a short notice job offer that Frankfurt would buy.