Drew, no she can't file in the province she's living in for another 6 months since she has to be living there for at least 12 months before she can file.
There may have been several reasons behind sending me the letter. They ideally would want me to simply agree to everything my W is asking for which won't happen since my W seems to be sticking with the "every other weekend plus shared holidays" idea. The letter does threaten that if I do not agree with her terms by March 9th (tomorrow) they will go ahead with filing an application which is not the same as filing for D. That would basically just be an order that would attempt to define custody, child support etc. My L has told me not to worry about that.
Me-40,W-37 D7, D5, S3 Separated Oct 3/2013 T 11 YRS M 7 YRS