Change One's Mind Meaning

(idiomatic) To decide differently than one had decided before.

Example:   She started up the stairs, changed her mind, and turned to go back down.
2006 Baggs, Amanda, Changes in Self-Awareness Over Time, Disclaimer on Assumptions, [http://] ballastexistenz.autistics.org/?page_id=294 May 2006:
  So don’t necessarily assume that something has changed if I appear to have changed my mind, sometimes my mind is all that’s changed.