Windows 7: Trying to create Contact Groups in my manager's contacts

I have access to my manager's calendar and contacts (not e-mail). She would like me to create several Contact Groups for her. I click on her contacts, so that her contacts are showing on my screen. From there I click on New Contact Group, Add Members, From Outlook Contacts. A box opens but the contacts are mine and not my manager's. I click on the Address Book dropdown arrow, but I only have the choice of my contacts. Is there a way to add her (her contacts) to the dropdown box? Or is there another way to create a Contact Group with her contacts? Thanks!!