Maura's Illuminated Manuscript

I'm not quite sure what you mean about "she wants it tacked onto the end of the maintenance", but if your final judgement specifies how that's to be paid, she doesn't get to change that arbitrarily, and if it doesn't, you have just as much right to choose how it's paid out as she does. If, e.g., a lump sum works to your advantage, you're allowed to choose to
pay the lump sum.