Jenny is still in transit. When she gets to her mom, she will send a picture of her passport stamps. I suspect she has neither her visa along her green card with her.
Based on Mike E's comments, she will have the picture of her green card and me waiting at the airport with the green card. PDX MAY be relaxed about these things. It is recovering from a terrible reputation, years ago for international travelers, lost its CBP presence and worked hard to to get it back. When I returned to the area, I was pleasantly surprised by the number of international connections.
Some have commented that shipping to a war zone is risky. I agree. My thought was to ship to a hotel at the airport in Warsaw - not a war zone. But I will go with Mike E's suggestion: relax and pay the fee if it is assessed. Not a huge deal.
To Sam Burns - yes, you are reading to much into this. I adore my young wife.