I think it's very likely that she kept notes of events, in her diary, even though in this instance her defence is she did nothing.Is it possible she kept a journal / diary either on paper or on a device or on a private blog? That maybe she reviewed periodically and reflected on or even angsted / obsessed about?
Some people I know, especially academic types, write down such a lot of day to day information and thoughts and keep it on a semi permanent basis but review it and contemplate it a year or two down the line. I think they like to analyse progression of projects and endeavours but also enjoy looking over the past for personal reasons. Also FB / social media works a bit like that - the ‘memories’ photographs pop up or the ‘on this day you were…’.
JMO MOO
The Facebook prompt I'm less inclined to believe because they haven't reported that she searched baby K's parents before that date.
MOO