Help! Users w/ Admin access to Win2K?!

I support a call center with approximately 80 PCs on a peer-to-peer network (no domain server). I am in the process of rolling out new PCs with Windows 2000. Suddenly, I have a manager who thinks the users all need to have administrator access to their systems. How do I educate this manager on this issue? I have not yet heard her reasons for giving admin access, I just want to be prepared when we have a meeting next week to discuss the issue. Thanks, in advance for any help!