Breaking her media silence once and for all -- Chelsea writes in great detail about her personal experience on the morning of September 11.

But, the DRUDGE REPORT has learned, her account now sharply conflicts with her mother's version of Chelsea's New York adventure.

Appearing on NBC's DATELINE, Sen. Hillary Clinton told how daughter Chelsea cheated death on that fateful morning.

"She had gone on what she thought would be a great jog," Hillary Clinton explained. "She was going down to Battery Park, she was going to go around the towers. She was going to get a cup of coffee and - that's when the plane hit!"

Hillary's dramatic story about her daughter's close call with the Twin Towers became a media sensation.

"At that moment, she was not just a Senator, but a concerned parent," TODAY show's Katie Couric told viewers.

But now, in her own words, Chelsea does not mention a jog. Does not mention her plans to go to Battery Park, around the towers -- only to be stopped by a coffee break.

In fact, Chelsea writes that she was at her friend's apartment on Park Avenue South -- miles from Ground Zero -- when she learned of the attacks!

"I stared senselessly at the television," Chelsea writes.

Calls to Senator Clinton went unreturned on Friday.