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So quick question, Hydaelen is pretty clear that she and zodiark were split across all 13 reflections of the source, she specifically says "We" when talking about how the sundering went down after we beat her primal form up.
Do we know what happened to either of them on the 13th given that it wasn't folded back into the source? I have to assume they got mined for aether pretty early on by voidsent.
...are you up to date on the MSQ...?
6.4 Spoilers
The chunk of Zodiark stuck on the Thirteenth's Red Moon would have been dissolved and its souls returned to the Lifestream when we (or Fandaniel / Amon / Hermes, I guess) defeated and destroyed him on the Source. Unfortunately, the Thirteenth's lack of a Lifestream due to being, well, the Void meant the souls had nowhere to go, and they ended up festering there until Golbez tosses Azdaja (as his Shadow Dragon) in there to create the monstrously powerful voidsent "god" Zeromus.
The fate of Hydaelyn's sundered self on the Thirteenth hasn't been explained, really. Her having sundered selves hasn't really been a crucial story beat, and I'm not convinced she actually did and just administered the sundered worlds from the aetherial sea. Regardless, her defeat and death should have sublimated her reflections' aether just like our own, assuming they behaved like Zodiark's.
The only indication I'm aware of Hydaelyn being sundered was a comment from the Watcher which I suspect was a mistranslation.
If the (partial) point of sundering was to gain the upper hand over the larger Zodiark, splitting her own power to the same degree would be defeating the purpose of the exercise. It seems more likely that she would somehow remain whole and able to reach into each of the shards from the centre of the aetherial sea.