Denise, really glad the school worked it out for you without you having to fight it. My ds is in grade one, and there's usually one split class in the school (200 students or so), and I really, really, really wouldn't want him in a split class. In fact I will take your example and put it on file if it looks like his grade might become "subject" to a split. (The classes are huge--both gr 1 classes have TWENTY SEVEN kids, with the normal occurance of learning and behavioural challenges and NO FT aides. Kindy is capped at 25, which is what it was last year but we had some new kids arrive, don't know the caps for higher grades, but I can see a few more kids in the neighbourhood could, SHOULD push it over the top to another class.) I have a teaching background, secondary not elementary, and while I don't know the details of running a split class, I know the burden on our teachers is large enough.
Anyway, that was rambly! I am glad it worked out for you, and totally understand your misgivings. Hope your daughter flourishes in her new class.