Right, this is going to be my pet theory for a while (BTW, a Pet Theory is a Theory in which one does not have sufficient evidence to pass it up the chain, but which they feel is correct. It tends to be treated like a 'pet' and fed tidbits of info until either rendered impossible or proven correct).
So we have a solid chain of facts.
1: Kamala is floated as to be considering the 25th during the start of this.
2: The Cabal War went hot, every man for himself, media companies fighting.
3: Jill Biden was the one to make Joe Biden not move the date.
These facts are solid, but there is very little to link them. So I propose this:
1: Jill Biden took advantage of the Cabal War to seize control, convinced Joe he should only listen to her, and is now controlling his... basically everything.
2: Because she and Kamala both hate each other AND Kamala is a "pretender to the throne" Jill moved to shove her as far from Washington as she could be.
3: Kamala is not taking this lying down, and has begun moving to use whatever plans she made in Fact 1.
4: Her first step will be uniting the Cabal behind her, Jill is a threat to all factions of the Cabal and Kamala so this seems a good alliance.
5: It will require Kamala becoming a willing puppet, but that's better than destruction.