WinXP Pro can’t synch network password

The user has Windows XP Pro. The network login is Novell, then comes the local Windows workstation login. On all other computers, there is a checkbox option on the windows login that basically says “change my windows password to match my netware password after successful login”. We have people use this to synch their passwords again when the Novell password expires and changes. For this one user, that check box is greyed out and does not allow her to utilize it. She has manually change her password in Manage my computer, local users and groups, etc. She has client for microsoft networks installed. What else can cause this? Is there a local policy that can keep her from using this?? I appreciate any help.