Sorry I'm not able to answer your question.

Have you made a quick search here in the forum? I do recall these question have been raised before.

Maybe your Fiancee can contact NSO and ask for their advice and what exactly they normally need for such documents.
I don't believe it's critical information for a CENOMAR .

A CENOMAR ( Certificate of No Marriage Record) is simply what its name implies...
It is a certification issued by the NSO stating that a person has not contracted any marriage within the Philippines.