User access to a department's public calendar

I'm a computer support specialist working for a company running primarily windows xp pro machines and exchange 2003 for an email server. We have about 75 staff in our office in Minneapolis. Our receptionist hand updates a chart daily (yeah, kind of laborious) with any information regarding staff doctor appointments, vacation, business travel...basically anything that would take a member of staff out of office. She likes to be able to have a quick reference to who's here and who's not when somebody calls looking for a particular person. Within her Outlook 2003 client, she got access to a public calendar for each department of the company. She looks at these calendars on a daily basis to gauge who is present vs. who is absent. However, she's unable to see one particular calendar, that of our Finance department. It's located at PUBLIC FOLDERS --> ALL PUBLIC FOLDERS --> FINANCE --> FINANCE CALENDAR. Literally, she can't see it. She can drill down and see the FINANCE folder but cannot see that calendar item underneath it. Why is it that those in finance can drill down and see this calendar but she cannot? If it's a rights issue, how do we go about assigning the appropriate rights for our receptionist to view the finance calendar? Is this done on the exchange server? Active Directory? Any help is much appreciated!!
Thanks,
OMARBR763