... when Raymond the butternut squash went to sleep... 
She was similarly upset when Lola went to bed.
An evening of Cbeebies while I am suffering from pg nausea seemed very upsetting to her. Lots of cuddles but she still seemed sad.
I am wondering if it might be some sort of separation anxiety, although she went to bed fine last night.
Any suggestions? Does anyone else's DC find TV (and sometimes books, come to think of it) really sad for no apparent reason?