There are a couple of tracks running here.
The first the the FBI is closing in on an indictment that includes e mails and a play for pay scandal with the clinton crime family foundation. That requires she stay in the race to forestall any indictment to after her election (as a sitting president she cannot be indicted as demonstrated by Nixon but she could be indicted before inaugeration. My guess is that tolls the statute. This is too involved to happen.
Off the same track is the O hoola agrees to pardon her in exchange for her withdrawal from the election and he gets to pick his candidate. I think this one is unlikely as he does not want his fingers on what could be a losing proposition as he plans to be in DC as a shadow government during the next administration.
Another, Hitlery cites health reasons for leaving the election and she is never indicted. All happy here as the entire corrupt DC establishment is saved from a lot of grief. Someone in her circle will be indicted and agree to some minor penalty and will be amply rewarded by the crime family foundation for their loyalty. The party moves on, unscathed, and runs someone with little record for Trump to attack...don’t discount Biden running with Liahontas or McCaskill? A maybe.
Most likely, no indictment, Hitlery runs Trump wins, GOPe aligns with Dems to kill off anything he proposes, FED collapses the economy, Trump gets blamed and life moves on toward the next election with a GOPe candidate taking the primary.
Take your pick and place your bets.
Sadly, America is the loser in every one of your scenarios.