The point of the Dems forcing a female African-American VP on Sleepy Joe is that, as soon as Sleepy Joe resigns from office for physical/mental health reasons, the Dems are then perfectly situated for the next 8 years. If any Republican protests any of Biden's moves, there's little that Dems can say in response. But a President Kamala enables the Democrat Party Cabal to constantly scream "sexist!" and "racist!" at any Republican who dares question anything Queen Kamala says or does during the next 8 years of her administration.
The Democrat Party Cabal is an Evil Genius.
To add to your theory, dollars to donuts she was made aware of the plan and subsequently dropped out of the primaries knowing the fix was in.