The problem with conspiracies is that the larger it is, the more likely it is that someone will cave or blab. Either Nancy is the blabber, or this is just posturing and bluster.
Yes Nancy has a tendency to run her mouth about topics where is becomes clear she has no idea what she is talking about.
Here is a prime example: https://www.youtube.com/watch?v=bSR0PvG9F_I
Nothing to blabber - everyone knows the Dems will be stuffing votes bigger than they ever have - so it seems likely Nan knows that the effort is even bigger than thought - and some other scheme may be in play we know nothing about now like: we only really learned about ballot harvesting after the 2016 election. so maybe a like surprise they are cooking up.