I agree, I think you handled it properly, and I admire you for having to deal with this type of thing with children involved. When I think of how hard this is for me, with no children involved ,it only make me realize how much stronger people are and that I want to be like in the future.
I think you're answer of "you filed, you agreed once a month, that's what we'll adhere to", is perfectly fine. And if she wants to take that to the courts, she's welcome to, but it would likely be hard to overturn that without some sort of life event happening that would cause them to be in Toronto more than once a month.
Good Luck to you Sir, I hope the best, and thanks for allowing me to listen in (yeah yeah, public forum, but still). thanks for sharing. I hope I can provide some value at some point.