She has no idea why she wasn't allowed to enter with the meal she retrieved for her new mistress. To say that she doesn't know and doesn't care wouldn't be quite right. Pilara does not at this point have a care for her mistress's potential woes, and actively prefers that Pilara's own next phase of life be more interesting. So, yes, Pilara is privately kind of hoping that her Lady has already been caught up in some dreadful entangling intrigue.
Outwardly, Pilara will be seen to enter shortly after the last visitor departs, expressionless as usual, escorting a maid bearing a fancy but quickly-preparable palace meal suitable for a hurried Princess.