Try to determine your overall time % for the whole year. If it is 40% or more, you could argue for the shared custody CS arrangement, under which you would be paying very little (assuming you make just a little bit more than she does - outside of the one mat leave year).
Regardless of any potential change, I think that she might have a good court case to ask for retro-active child support for the 5 years i.e. 5 * 12 * 100 = $6000! If the yearly time split was 40-60 or wider, her case is stronger. Probably something you want to avoid!
Can you argue to keep the status quo, on the basis that you are right on the 40-60 line, and that '$100 below table amount' is a reasonable compromise between the shared custody rule (where you would pay much less) and what she is asking for (which ignores the fact that you also are bearing costs to raise your child). You can mention any facts that indicate you have a full role as parent - involved in school, activities, transportation, trips and list any significant expenditures beyond the minimum for a bit of clothing and food.
First, I'd suggest you ask her (in email, so that you have a trail) why she feels that the status quo is no longer agreeable. Have her put her cards on the table. Her decision to have another child and go on mat leave is NOT a good reason for you to pay more! (I'm assuming that's the reason)
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