directing clients my doc dir. to network

I have a user who is newly hired. She is using a pc that was used by another staff person who she replaced. They created a user name for her and directory on the network. Her My doc dir. goes to the old users dir. on the server. Now she wants to switch computers. How do i configure her “my doc dir” Is it by user in profile if that is the case shouldnt it just go in the proper place when she logs on to any computer [which it doesnt] Or is it by workstation.
Also I would like to add powerpoint to the computer. Her c drive is read as a nework drive [i think] and will not give me access.
thanks