Probably nothing, when her supporters look around despite her obvious baggage, they see a mentally deficient Biden, a colossal bitch in Harris and no one else, so why not Hillary, the 2016 election was stolen from her in their minds, it’s entirely feasible they believe she’s the right person for President.
Her rank and file supporters don't pick the party nominee. That is generally done by the power brokers within the party. In 2 years many of the old Dem guard will be moving on, and the progressives who are taking over the Dem party owe Hillary nothing and she offers them nothing, therefore she isn't going to get the nod.