Luckily, Windows XP wasn't all that secure, and it's relatively easy to get into the computer.
First, she should try logging in with "admin" as the username and leaving the password field blank. She also could try booting into safe mode. Since neither of those worked for Naomi, she'll have to look for a program that will hack into it.
She should be careful though that the system isn't using built-in encryption. If it is, then cracking the password would make all of the data inaccessible.