On any of the people involved in a Shared fact, highlight a fact, look in the right pane unfer [Fact] details. You will see a Share button. If the fact has not been shared it will say Share this fact to the right of the button. If the fact has been shared, it will say [number] people share this [Fact name] fact.
I have done this and the people are in the database rether than just type a name they still dont appear in narrative or individual reports for the lady in question who I believe is the principle or sharee.
On the Edit pereon screen, you can select Options and check or uncheck Show shared events for that person.
I think some indication here would be useful