The person who shows up as VIP is not in my Contacts on my iMac. She does show up in Contacts on my iPhone. I've looked at all the possible data entries on the iphone under her name and do not see any VIP entry possible. I'm going to try to delete her from my iPhone and see if that helps.
Nope, deleting the contact from my iPhone did not help.
I'm going to stop and restart mail without rebooting.
Nope, that did not help.
I have just re-scrutinized all of the Mail menu items and see no mention of VIP.
I completely turned off and restarted my iPhone. Thontact is still gone from Contacts on my iPhone. It is still present in Mail on my iMac.
So far, the problem has not budged one inch.