AP Memory Maker and Friends

[asheleycs]

I have a friend who recently returned from a trip, and there is one picture I want of her family. She didn't have memory maker, but I linked her to my account (although near the end of her trip). I can't see any of her pictures. We have ensured that she's sharing photos with me. I'm assuming the problem is that it will only show pictures taken after I linked the accounts. Is there no way to make it work retroactively? I'm happy to pay for the picture, but I'd like to do it through my account. Anything obvious I'm missing?

Thanks!