Simply send the invitation to her, in her name. Bear in mind that if she is in a committed marriage this is not a polite thing to do. If her marriage is in some way compromised, just ring her with a personal invitation.
You address the envelope to the person and only put "X, Y and guest" on the invitation.
Reverend & Mrs.
The Honorable Nelson A. Rockefeller and Mrs. Rockefeller
When addressing an invitation to an ambassador and his wife, you should use their official titles. For example, you would write "The Honorable [Full Name], Ambassador of [Country]" for the ambassador, and "Mrs. [Last Name]" for his wife. If the wife holds a title of her own, you may use that instead. Ensure to format the envelope and the invitation card properly, maintaining a formal tone throughout.
The address should read (an example): Dr. John Doe and Mayor Jane Doe.
Use the term Honorable Judge on the envelope. For example Honorable Judge Smith and Mrs. Smith. On the invitation Judge Smith and Mrs. Smith would be fine.
Address it to Mr & Mrs. Jones. That is universally understood.
When you address a letter to a person in the military, you address it by rank. Colonel John Smith. First Sgt. Joe S. Miller. There may be 10,000 men on the base. There will probably be only one Colonel John Smith, Likewise, with First Sgt. Joe S. Miller. The object is to get the invitation to the right person out of 10,000 some of whom will have identical names.
Mr and Mrs (last name here) David and Joan (last name here) (last name here) family
When addressing an invitation to a two-star admiral in the Navy and his wife, use the following format: "Admiral and Mrs. [Last Name]." If you wish to be more formal, you can also include "United States Navy" in the address. For example: "Admiral [First Name] [Last Name], United States Navy, and Mrs. [Last Name]."
To the wife only, just as Mrs. She has no title of her own.
* Yes, the name and address on a wedding invitation should be centered on the envelope and your return address on the upper left.