Is your DM ok?
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Yeah, why?
As someone who has DMed myself, such a huge scenario sounds absolutely exhausting.
Oh that, so she's been planning this war thing for a while now, it's been the endgame of our current campaign for about 6 years now. I will point out that, as of the war starting, she's actually using two systems.
We have the usual actual D&D battle if the player party actually enters into proper combat, which is largely meant for when we actively move to encounter special units ourselves, which we will be doing next week as we move to try and take out the Countess who heads up the upper markets where slaves are sold.
But most of it thus far as been an overworld strategy game style of battle she worked up for it, where we have units who's HP signifies the number of members in that unit (Barring special units such as our party being one unit, a slime rancher we recruited, the Pirate Queen's crew, etc), and each unit has a set damage number, a set bonus to attack, an AC and a Morale stat, like so-
Moon Warriors-Infantry HP-8 Attack +5 Damage 1 Morale +3 AC 14 Range 1
Slime Rancher-Special HP-10 Attack +7 Damage 1 Morale +2 AC 14 Range 2
Overworld battle is simply attacks of one unit on another, you choose to attack a square in range. For normal units, your damage goes to the least damaged, non special unit in the square (Ala infantry battles), and special units can choose specific targets to press a weakness or go after enemy commander units. If a unit drops below half health, they have to make a morale save or spend the current turn fleeing.
As an example, my party popped up in the middle of the city with our slime rancher and two platoons of Moon Warriors. This means our square had four units. A neighboring square had two Drow units, so our moon warriors attack there and their damage, if they hit, applies to the unit with the least damage, but either the party or the slime rancher can target a specific enemy unit to try and wipe it out with our better range or damage (The party has 3 damage in overworld). This means the infantry battles are more streamlined and the special units can more specifically target weakened units to lessen the number of attacks against our side.
Lastly, at the start of each day is the Tide of Battle roll to determine which side resolves their actions first during the day, with two actions per day (Actions currently are Unit Movement and Unit Attack, other things may become available as things progress)
that unit fighting mechanic is kind if similar to how pathfinder 2e's troop enemies work
That sounds really awesome!