For her purposes, she doesn't have to necessarily get enough additional votes to change the result in the electoral college; a close second best is racking up enough additional popular votes to further delegitimize Trump's election. About 126 million votes were cast, so right now her lead in the popular vote is a little over 1% of the total number of votes cast. If she can pick up enough to get to a margin of 2.5 million votes over Trump, that would represent 2% of the total votes cast. At some point the import of that fact becomes almost undeniable: US elections are seriously out of sync with the concept of a well-developed democracy and simply reciting the canard that the US is a republic, not a democracy, is not going to cut it.