Nancy Miller (Mitchell) - Nancy vs. Nancy

I could use some help, Erica Howton. I've wound two people together and I'm not sure how to extricate. Nancy Miller is the MP for the wife of Andrew Miller, and I've been trying to determine more about her. Signs pointed to a marriage in 1806, but the actual record lists a HENRY Miller (and weirdly, Ancestry.com has the wrong info). Hence this isn't Andrew's wedding.

I'm certain the 1806 wedding should be for a DIFFERENT Nancy as well, this one Nancy Mitchell.

Can you create a new profile for Nancy Mitchell and remove that birth surname from the MP profile of Nancy Miller? I can clean up the records to associate them with the correct Nancy after that. Nancy Mitchell's parents should be associated to the new profile as well, rather than to Nancy Miller.