How though? Facebook memories is just things either posted by you, things you have been tagged in, or things posted on your wall on that date over the years. The random collages my Iphone makes are pics taken on or around that date too.
So whilst something could have popped up that triggered the memory of it being the anniversary, she still had to remember the full names/surnames of the babies/parents. Sometimes she had minimal interaction with these people and she's remembering their full names for a year? In my opinion, she was keeping them noted down somewhere.
MOO
That's what occurred to me. Unless LL has a really, really good memory for dates and anniversaries. MOO.