Tween morning anxiety is often about social complexity: what will happen with a specific person, how a situation from yesterday will play out today, fear of being visible or evaluated in a group. The social stakes feel enormous at this age because neurologically they are. The tween brain registers social threat similarly to physical threat. The morning anxiety is a genuine alarm response, not drama.
Something about today feels like a lot. I am not going to minimize it. What is going on?