I assume this is not a public school because they'd have just brought in another teacher IF this one was let go or quit.
Here are my questions.
**Was this downsizing done for financial reasons? If so did they discuss this in the PTA meetings? Did they do anything to let the parents know this was going on where they could try and find resources to stop this change? I'd find out from the district offices why this happened and what could be done to keep it from happening/if there is any way to keep that teacher.
**What is happening to the previous teacher? Is she being fired? Did she quit? Is she being moved to another classroom? In another school?
**Were the classes full size? For instance, there are laws that determine how many kids can be in one teacher's class depending on age of kids and such. In our town the kindergarten class can have 26, or maybe 28, but they can't go over that in a normal every day sort of circumstance.
Our elementary schools are overflowing. They have full classes in many of the schools. Even if new kids move in they are sent across town to another school because that other school might have one opening. In one family they had moved to our town and when they went to the local elementary school to enroll their kids each child was in a different school throughout the town. The mom and dad both worked and the kids could NOT be transported by bus from the local school to the other schools because the buses were full already. They weren't where they could do private school fees.
They bought their home where in this particular school boundary so their kids would be at the better school. It has a long history of A and A+ score ratings. But found out after they'd moved in that their kids wouldn't be able to go to that school. They finally did get enrolled there the next year but still, one of their kids the next year still had to go to another school. The third year they were all in that neighborhood school though.
**Were the classes so small in 3 rooms/3 salaries that combining the 3 rooms into 2 rooms they are still under the size limit?
If the new classroom is going to be overcrowded and on the high limit side you parents need to monitor that classroom size frequently. After the holidays they might have new students moving in. Do not let that classroom go over the maximum limit.