Still not sure then why you are waiting till Feb to make the changes. By then the group you have will have adjusted to the schedule and you will be used to doing it.
I would think the start of a semester is better for finding a new placement than mid winter.
You could also do it now with the idea of you will hang in there as long as you can while she is looking with the understanding that the deadline for the change is whatever date you give. At least the parent can start looking now. My guess is she didn't look very much in the summer because that is when choices are at their maximum.