Hello Sharon, Welcome to Rootschat.
Rootschat has a policy of no living persons. It is meant for people tracing their ancestors rather than anyone currently living.
Why have you not been able to obtain your friend's marriage certificate? Is there some kind of cut off date after which you cannot obtain a certificate?
Have you tried writing to a local newspaper and asking if anyone remembers her and where she may be now? Any of her relatives that you can contact for information, her parents for example?