In September 09, the only ID that will be required is the Passport. It doesn't matter that other ID is in her married name - the booking must be in the name on her passport.
If you need a picture ID to get onboard in a foreign port of call, then you'll need to use the Passport. You'll also need to make sure you have a picture ID, if you use a credit card, so the name matches.
DS - 
Cruise Specialist
ShipVacations.com
888-650-9990 or
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Princess Elite Member - Commodore
RCCL - Expert Plus
Cruise History-
RCCL Oasis of the Seas 9/4/10 (Future Cruise)
Carnival Dream 1/23/10, 1/30/10 (Future Cruise)
SeaDream 12/4/08 (Future Cruise)
Dawn Princess 5/4/08
Carnival Spirit 3/21/08
Elation 2/28/08 and 1/17/08
Carnival Liberty 10/07
Disney Magic 7/22/07
Carnival Paradise 1/12/07
Carnival Victory 9/4/06 and 5/1/05
Carnival Pride 6/11/06
HAL - Ryndam 9/05
NCLA - Pride of America 7/8/05
Caribbean Princess 4/16/05
Carnival Elation 2/27/05
RCCL Monarch of the Seas 12/17/04
Ecstasy 9/3/04

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