But can you add more than one Google calendar? My wife and I always shared our gmail cal when we were on the iPhone. I have the Droid X which allows multiple gmail calendars but I can't add another account to her Fascinate.
Could she have activated her phone using the same account as I did on my phone to begin with? This might help with this issue.
I don't have this phone so I do not know how to do this via the phone BUT you can share you calendar with other GMail users. I can view my boyfriends calendar on mine and mine on his. I set it to show up in different colors. When viewing my calendar on my Droid I also can view his without having to add his GMail settings to my phone.