|"This thing did not come with any disks when she bought it"|
If this is an OEM system (Dell, Gateway, HP, etc), the actual Windows XP discs aren't provided, but the HDD has a hidden Recovery partition & a utility is provided to create the XP Recovery disks. Creating the Recovery disk set is one of the 1st things you should do when you buy a new OEM PC. This is explained in the documentation, but the majority of people never read it, therefore the disks never get made. Then when they get in a bind, they resort to some sort of half-azz repair attempt.
When you say the system "crashed", what exactly do you mean? Before you got your hands on it, what did it do when you attempted to boot? Did you try booting to Safe Mode? Did you try loading "Last Known Good Configuration"? Did you try using the Recovery Console? Or did you head straight for the XP Pro disc? And how did you go about patitioning & installing XP Pro? If you did it "correctly", the system now have 3 partitions - the hidden recovery partition, the original XP Home partition & a new XP Pro partition. Is that correct? Or did you wipe out everything?