Greetings and thanks for your kind replies.

The Guillory's and the Donato Bello's intermarried many times.
Marie Taileffero is mentioned often, but no extra info on her is given in anything I've seen.
I will check with New Orleans records to see if her birth record is somewhere.

btw:
There are excellent detailed web pages on Guillory's here:
http://members.aol.com/RFraz34007/

Best Regards,
Anne