After you file

Thank you.  Well, this is really a return my Mom (82 years old) sent in incorrectly.  She did receive the letter from the IRS and the refund.  She called and was literally on the phone with them for 2 hours only to get no answers and the representative was uncertain as to whether or not she'd be eligible to amend her form...he referred her to IRS.gov...ugh!  Anyway, I believe you said amending is fine as well.  I'm assuming because my Mom's original submitted tax form was incorrect that I will have to re-due it so it matches the IRS calculations then amend based on that?  Am I correct?