Her insides are moving, sloshing and grinding against themselves, and her body knows what's up even though her mind – her conscious thought – is fighting. It's not about the babies, even though so much time has been taken up with thinking about them. It isn't even about Anna, though it probably should be.
It's about her.
It's about her and Anna and how she feels, and Elsa's whole heart sinks because she knows why.
She grabs her book and leaves her chocolate, and if Anna notices, well... Elsa doesn't.
She just has to escape.