LBH w/ a WXW after the D - now what

[gs9]

Ugh! here is the next crazy thing from WXW that I need help with. I sent her a message telling her D4 needed to be registered for kindergarten and asked her which schedule worked best for her. D4 is already attending preschool at the elementary school closest to the home she has lived in for 3 years and that I am keeping. WXW is planning to move to a city about 20 min away.
WXW reply - "We will need to address where D4 is going to school in the fall.
I'm happy to meet with a mediator to discuss."

Ugh! I'm pretty sure the courts would rule to have D4 stay in her current school even though its only preschool but seems like WXW is just trying to kick me when I'm down. Trying to cause as much havoc as possible.