I'd be looking for a specific cause, and not immediately accept the change of school as a general cause for a single spectacular meltdown after a full month. My son is inclined to say he had the worst day ever and cry about it, but we figure out that someone was playing one game that he didn't want to play, and they invited him to play but wouldn't change the game at ten in the morning. After that, he had all sorts of good stuff, but then when he gets home he dwells on that one incident.
Another area to explore: is it possible that she is actually being challenged and until now has never had to face a challenge and never learned those coping skills? Happened to many of us who didn't get appropriate instruction in school. But it happened when we hit college and had no idea how to buckle down, study, etc.
