Great job!
As far as the ceremony goes, most people I know don't walk. They are content with getting the diploma in the mail. Usually grad announcements say just that, that the person graduated! So perhaps you could tell her you chose not to walk in the ceremony. Also, at my college graduations are ticketed events and there are not many tickets available. So perhaps you could tell her all the tickets were sold out before you could buy any! \
This is a huge accomplishment, so definitely let it be all about you!