Open a command prompt from your computer and type:
Code:
net use * \\Dellchrystel\c$ /user:dellchrsytel\Administrator
When it prompts you for the password, enter the Administrator account's password from her machine. If this works, it means that Windows isn't being too smart by itself about what user to use when you're trying to connect to her computer, but forcing it to a different account will work.
If it doesn't work, give me some more time to think
