When the headlines stated that Meghan, "made a surprise appearance" at Oprah's book event, she crashed it. It's her habit. Then the "dashing out to make dinner for Archie and Lily? No, she ran out to avoid Oprah and a confrontation.
It's funny we don't see all of the "audience" or people that attended. I don't think Harry was there and I doubt Ellen or Ted were there. If they were there, Meghan would have made sure she was pictured with them, unless she was terrified of Oprah's temper.