Lindsay Lohan Thinks Jail Isn't a Done Deal

Robert Shapiro can work wonders -- he was part of the team that got O.J. Simpson off -- but sources in the crazy world of Lindsay Lohan say he has not convinced her that she must surrender to a jail sentence.

People who are interacting with Lindsay tell TMZ she has been in obsessive denial over her surrender Tuesday, when she must begin serving a 90-day jail sentence -- which will be whittled down to 22 days behind bars.

Lindsay is convinced there is still a way she can avoid jail, even though Shapiro made it clear he would only rep her if she went to the pokey.

Here's the irony -- Lindsay expects Shapiro to pull a Shawn Chapman Holley ... code for getting the judge to overlook her past screwups and keep her a free woman. Holley eventually quit when Judge Marsha Revel made it clear ... there were no more cards to play.

And, we're told, the reason it took so long to find a new lawyer is because Lindsay only wanted someone who could keep her out of jail but no credible lawyer would make that promise.

And here's the thing. From what we're hearing, there is no way in hell Judge Revel is going to back down.