Connecting Xp to File server.

HI,
I am a recent new administrator. And I had a user who had a a mapped drive to there File server on the domain from here XP Home laptop. But we are in a domain invironment. How was she able to get access if she is not able to log on to the domain with home edition. Now I need to get it back to the way it was but she is unable to acces the file server even after i have moved it back to her desk where she said she was able to connect before with her laptop.