Iceberg, I completely understand. I've been through this myself with my ex.
In our case, because there was no precident set, and realizing that my ex would never allow our son to go to a school "other than" the one that was closest to his house, I negotiated an additional clause into our separation agreement.
You see...in our case, my ex moved about a 30 minute one-way commute away...in the same city...and then insisted our son go to the school that was 1/2 a block away from his house.
So...I weighed the pros and cons...and then negotiated based on the information I had at the time. Which was: 1-knowing my ex was not planning on staying in that area for a long time, and 2-knowing that my ex had a bad experience with going to school outside of his neighbourhood when growing up...so he had no school friends to hang out with after school till about grade 10.
Pros:
- every other week our son would be able to walk to and from school
- every other week he'd be able to play with his friends from school after school (not so important in kindergarten...but very important as he gets older)
- the school by the ex was a way better school and environment for him than the school he would be bused to from the daycare he was currently attending
- once in grade 1 he'd be able to attend a before and after school program (at either school) and busing wouldn't be an issue
- the ex's fears of our son not having close childhood friends in elementary school would be quelled (this was a huge fear for him and even before we had a child he talked about it often and how he didn't really get involved in sports or anything outside of his "family" because he had no close "buds" to do anything with)
Cons:
- our son would have to change daycares for kindergarten to be in the same school district as the ex (our current daycare did not bus to that area)
- my driving time would increase to 2 hours a day on the weeks I have our son (1 hour in morning and 1 hour after school/work). However, I turned this into a "pro" as my son and I now use the time to tell stories to each other, sing, tell each other about our day...and generally just have fun

- concerns that when my ex moved again he would once again insist on our son going to the school in his area
So, knowing the above "facts" I negotiated an addition to our separation agreement which states that should the ex move out of our son's current school district, or should our son (for any reason) need to change schools then I would be the one to choose where our son goes (while in elementary school). It also states our son would be able to choose, for himself, where he attends high school...should it be an issue.
Now...we are into Grade 1...and our son is having a blast. I'm also planning on moving to the area by his school...for the "friends" too
So I guess what I'm really trying to say...is maybe it would help if you took a look at all the known pros and cons in your situation and negotiate a little so you win the war instead of the battle.
- others have mentioned you having status quo for your child to go to school in your area. You already have a way stronger case than I did...and we had also already settled our separation/divorce at this point. So, in this case what would the pros be for your ex...and how can you negotiate around her cons so they will become pros for her?
My ex and I started our whole "negotiation" from the standpoint that we were both right and that the other person would have to just suck it up...lol. However...after our "emotions" died down (for me anyway) we were able to work something out. But...it did take weeks/months...and we had our son enrolled in "both" schools because we really didn't make any headway until June just before he started kindergarten.