keep her at the school is has been at.
Changjng familes is a huge upheaval for a kid. Let her have the consistancy of her peers.
Just imagine the moms that have kids training for the olympics, they drive for 3 hours each way everyday sometimes to ice rinks etc. Knowing that she is happy and not resentfel of you for "taking " her friends away is worth the 75 minute trip each way . Also that gives you time to connect in the car, it may be very nice.