Wow that's a hard one!

Are you 100% sure that you'll be moving closer to school A?

If so I would be inclined to suck it up for a year and would drive the 45 mins each way, that is if you can afford the petrol etc.

I guess it also depends on how well your DD handles change and how easily she make friends. For me, I would prefer that they were settled into a school they were staying at, rather than just getting used to one place, making friends and then having to move on at the end of the year.

Tough decision! Good luck

Tough decision, good luck!