Losing her marbles?

Trigirl is seriously wondering about the state of her marbles. She was convinced it was Junior Trigirl 1's school trip today, despite having the correct date noted down in her calendar and it coinciding with Tirgirl's Grandma's 90th birthday. Trigirl nearly sent Swimmingman with Junior 1 down to the train station in the snow and ice. The school trip is a month from today, so this was not one of Trigirl's finest moments.