I am the mother of three and MM and I were pregnant at the same time twice (MM, the copycat
). Anyway. This would be the worst time of the year to leave my kids with someone else because school is so busy. There are plenty of exams, long-term homework, etc. etc.
She didn't mind taking her kids out of school for their first "finding themselves" trip, so why should she care if she leaves them during the busiest time at school? Education is not a priority for her, unless it includes a shiny new diploma with the word Harvard on it (and only for attending one seminar)