I second eastindywalrus' comments.
Skip the lounge @ AMS and put her up in the Yotal onsite, seeing she will be there for 18 hours. At the very least, she can unwind and get some proper rest, and get some food within the terminal, which is a hell of a lot better than the lounge itself in almost every way possible. I was recently in exactly the same situation; I opted for the hotel and was immediately already happier than being in the lounge.