While many are saying that Cultivation is "playing a much subtler game," or that she is setting up all these characters, it is a theory of my mind that the opposite is true. In fact, I think she is dying, or going to die in the near future, if not already.
You are seeing many of the promises that Cultivation made being broken. You have:
Dalinar getting his memories back, and his trauma back
Lift starting to grow and age normally again
The possibility that Odium's Intent -- namely, his passion -- might break the status quo (or total lack of one) of Taravanigan's mind
Due to the shared religion that Brandon Sanderson and I have, it has been my belief that gods, and as a result, Shards, work by Covenants, or put in Cosmere terms, Oaths... It is likely built into them, by their Intent. A god, or Shard breaks their own Oaths, and they will cease to be God (excepting the presence and indestructible nature of their Investiture... Cosmere implications, they get Splintered, or a fate similar to Dominion's and Devotion's). After all, you see:
Odium bound by his promise of the Contest of Champions
The death of spren during the Recreance as the Knights Radiant broke their Oaths
The likelihood that the Recreance also Splintered Honor through the same breaking of Oaths, including the Oathpact, where the Heralds specifically disobeyed Honor.
Preservation's resistance to choose anyone beside Vin.
And above all, the weaponization of the Dawnshards against Adonalsium, Shattering him.
Drat, can't remove or delete quotes... My mistake
Ach, spoilers, too... My incompetence speaks miles, haha. that aside, we also have:
The Command/Intent factor of Investiture
Notable for the importance of Command/Intent, a BioChromatic Entity's single-mindedness to obey the Awakener's command, i.e. Nightblood's Intent to "destroy evil"
Also, Intent is important for the creation of Anti-Investiture, where just singing the inverted Tone of a Shard will not do.
The existence of Dawnshards, created by Command and to fulfill the Command of Adonalsium.
There may likely be more examples, but I am getting ahead of myself. If Cultivation is not keeping her Oaths, then she is likely dead, or will die in the near future as a result. Of course, dead, referring to Splintered or similar.
On the other hand, it is a likely possibility and another theory of mine that the corruption of the Sibling has a part in Cultivation's death. Highly unlikely, as the Sibling is still alive and whole, and as a result, Cultivation, too. But I am just bouncing off ideas for the sake of using a sounding board.
This is just a theory from a Cosmere fan not as well versed in the universe as you are, but thank you for listening and suffering me, and I would like to hear some theories!