Frances has a field trip at school today: her class has gone to a relatively nearby conservation area for the day.
She doesn’t usually want to go to school at the best of times. All last night, she fretted about today and the trip.
Mostly, it was due to anxiety about lack of predictability: she repeated over and over again that she didn’t know what they would be doing during the trip.
Usually, the teachers will take the time to explain what she could expect to happen, but something (such as general busy-ness) must have prevented such a talk this time.
(Schedules and structure are really very important to Frances — she thrives on predictability. Her school has been very good in this respect.)